[pyassimp] OpenGL Viewer: improved camera behaviour, simple keyboard control
While here, lots of cleaning + short docspull/8/merge^2
Séverin Lemaignan
parent
ab268b9f48
commit
3b1464a6d9
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@ -6,10 +6,13 @@ objects in OpenGL.
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It loads a 3D model with ASSIMP and display it.
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Textures are currently ignored.
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Materials are supported but textures are currently ignored.
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Half-working keyboard + mouse navigation is supported.
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This sample is based on several sources, including:
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- http://www.lighthouse3d.com/tutorials
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- http://www.songho.ca/opengl/gl_transform.html
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- http://code.activestate.com/recipes/325391/
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- ASSIMP's C++ SimpleOpenGL viewer
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"""
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@ -22,6 +25,7 @@ from OpenGL.arrays import ArrayDatatype
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import logging;logger = logging.getLogger("assimp_opengl")
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logging.basicConfig(level=logging.INFO)
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import math
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import numpy
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@ -31,48 +35,31 @@ from pyassimp.helper import *
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name = 'pyassimp OpenGL viewer'
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height = 400
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width = 708
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zup = numpy.matrix([[1, 0, 0, 0],
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[0, 1, 0, 0],
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[0, 0, 1, 0],
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[0, 0, 0, 1]])
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height = 600
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width = 900
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class GLRenderer():
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def __init__(self):
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self.scene = None
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self.auto_rotate = False
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self.viewangle_h = self.viewangle_v = 0.0
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self.drot = 0.0
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self.dp = 0.0
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self.angle = 0.0
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self.x = 1.0
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self.z = 3.0
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self.lx = 0.0
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self.lz = 0.0
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self.using_fixed_cam = False
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self.current_cam_index = 0
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self.x_origin = -1 # x position of the mouse when pressing left btn
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# for FPS calculation
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self.prev_time = 0
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self.prev_fps_time = 0
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self.frames = 0
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def onkeypress(self, key, x, y):
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if key == 'a':
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self.auto_rotate = not self.auto_rotate
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self.viewangle_h = 0.
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self.viewangle_v = 0.
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if key == 'z':
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self.viewangle_v = -0.04
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if key == 's':
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self.viewangle_v = 0.04
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if key == 'q':
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self.viewangle_h = -0.04
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if key == 'd':
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self.viewangle_h = 0.04
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if key == 'c':
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self.fit_scene(restore = True)
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self.set_camera(self.cycle_cameras())
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if key == 'x':
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sys.exit(0)
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def prepare_gl_buffers(self, mesh):
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mesh.gl = {}
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@ -105,7 +92,6 @@ class GLRenderer():
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def load_dae(self, path, postprocess = None):
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#scene = pyassimp.load(path, aiProcessPreset_TargetRealtime_Quality)
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logger.info("Loading model:" + path + "...")
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if postprocess:
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@ -139,8 +125,22 @@ class GLRenderer():
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logger.info("Switched to camera " + str(cam))
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return cam
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def set_default_camera(self):
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if not self.using_fixed_cam:
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glLoadIdentity()
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gluLookAt(self.x ,1., self.z, # pos
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self.x + self.lx - 1.0, 1., self.z + self.lz - 3.0, # look at
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0.,1.,0.) # up vector
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def set_camera(self, camera):
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if not camera:
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return
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self.using_fixed_cam = True
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znear = camera.clipplanenear
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zfar = camera.clipplanefar
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aspect = camera.aspect
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@ -149,38 +149,30 @@ class GLRenderer():
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glMatrixMode(GL_PROJECTION)
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glLoadIdentity()
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### Compute gl frustrum
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# taken from http://www.songho.ca/opengl/gl_transform.html
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# Compute gl frustrum
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tangent = math.tan(fov/2.)
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height = znear * tangent
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width = height * aspect
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h = znear * tangent
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w = h * aspect
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# params: left, right, bottom, top, near, far
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glFrustum(-width, width, -height, height, znear, zfar)
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glFrustum(-w, w, -h, h, znear, zfar)
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# equivalent to:
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#gluPerspective(fov * 180/math.pi, aspect, znear, zfar)
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glMatrixMode(GL_MODELVIEW)
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glLoadIdentity()
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#cam_in_obj_coords = numpy.linalg.inv(camera.transformation)
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#glMultMatrixf(cam_in_obj_coords)
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#import pdb;pdb.set_trace()
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cam = transform(camera.position, camera.transformation)
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at = transform(camera.lookat, camera.transformation)
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gluLookAt(cam[0], cam[2], -cam[1],
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at[0], at[2], -at[1],
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0,1,0)
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at[0], at[2], -at[1],
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0, 1, 0)
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def fit_scene(self, restore = False):
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""" Compute a scale factor and a translation to fit and center
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the whole geometry on the screen.
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"""
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x_max = self.bb_max[0] - self.bb_min[0]
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y_max = self.bb_max[1] - self.bb_min[1]
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tmp = max(x_max, y_max)
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@ -190,7 +182,7 @@ class GLRenderer():
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if not restore:
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tmp = 1. / tmp
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logger.info("Scaling the scene by %.02f" % tmp)
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logger.info("Scaling the scene by %.03f" % tmp)
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glScalef(tmp, tmp, tmp)
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# center the model
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@ -201,8 +193,10 @@ class GLRenderer():
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return x_max, y_max, z_max
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def apply_material(self, mat):
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""" Apply an OpenGL, using one OpenGL list per material to cache
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the operation.
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"""
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if not hasattr(mat, "gl_mat"): # evaluate once the mat properties, and cache the values in a glDisplayList.
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@ -210,7 +204,7 @@ class GLRenderer():
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specular = mat.properties.get("$clr.specular", numpy.array([0., 0., 0., 1.0]))
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ambient = mat.properties.get("$clr.ambient", numpy.array([0.2, 0.2, 0.2, 1.0]))
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emissive = mat.properties.get("$clr.emissive", numpy.array([0., 0., 0., 1.0]))
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shininess = mat.properties.get("$mat.shininess", 1.0)
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shininess = min(mat.properties.get("$mat.shininess", 1.0), 128)
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wireframe = mat.properties.get("$mat.wireframe", 0)
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twosided = mat.properties.get("$mat.twosided", 1)
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@ -231,49 +225,19 @@ class GLRenderer():
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glCallList(mat.gl_mat)
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def apply_transformation(self, m):
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m = m.transpose() # OpenGL row major
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glMultMatrixf(m)
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def recursive_render(self, node):
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# save model matrix and apply node transformation
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glPushMatrix()
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self.apply_transformation(node.transformation)
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for mesh in node.meshes:
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self.apply_material(mesh.material)
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glBindBuffer(GL_ARRAY_BUFFER, mesh.gl["vertices"])
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glEnableClientState(GL_VERTEX_ARRAY)
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glVertexPointer(3, GL_FLOAT, 0, None)
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glBindBuffer(GL_ARRAY_BUFFER, mesh.gl["normals"])
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glEnableClientState(GL_NORMAL_ARRAY)
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glNormalPointer(GL_FLOAT, 0, None)
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glDrawArrays(GL_TRIANGLES,0, len(mesh.faces)*3)
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#glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.gl["triangles"])
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#glDrawElements(GL_TRIANGLES,len(mesh.faces) * 3, GL_UNSIGNED_INT, 0)
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glDisableClientState(GL_VERTEX_ARRAY)
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glBindBuffer(GL_ARRAY_BUFFER, 0)
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
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for child in node.children:
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self.recursive_render(child)
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glPopMatrix()
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def do_motion(self):
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gl_time = glutGet(GLUT_ELAPSED_TIME)
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self.viewangle_h = (gl_time-self.prev_time)*0.03 if self.auto_rotate else self.viewangle_h
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# Compute the new position of the camera and set it
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self.x += self.dp * self.lx * 0.01 * (gl_time-self.prev_time)
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self.z += self.dp * self.lz * 0.01 * (gl_time-self.prev_time)
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self.angle += self.drot * 0.1 * (gl_time-self.prev_time)
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self.lx = math.sin(self.angle)
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self.lz = -math.cos(self.angle)
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self.set_default_camera()
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self.prev_time = gl_time
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@ -287,21 +251,99 @@ class GLRenderer():
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glutPostRedisplay()
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def recursive_render(self, node):
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""" Main recursive rendering method.
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"""
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# save model matrix and apply node transformation
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glPushMatrix()
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m = node.transformation.transpose() # OpenGL row major
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glMultMatrixf(m)
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for mesh in node.meshes:
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self.apply_material(mesh.material)
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glBindBuffer(GL_ARRAY_BUFFER, mesh.gl["vertices"])
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glEnableClientState(GL_VERTEX_ARRAY)
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glVertexPointer(3, GL_FLOAT, 0, None)
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glBindBuffer(GL_ARRAY_BUFFER, mesh.gl["normals"])
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glEnableClientState(GL_NORMAL_ARRAY)
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glNormalPointer(GL_FLOAT, 0, None)
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.gl["triangles"])
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glDrawElements(GL_TRIANGLES,len(mesh.faces) * 3, GL_UNSIGNED_INT, None)
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glDisableClientState(GL_VERTEX_ARRAY)
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glDisableClientState(GL_NORMAL_ARRAY)
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glBindBuffer(GL_ARRAY_BUFFER, 0)
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
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for child in node.children:
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self.recursive_render(child)
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glPopMatrix()
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def display(self):
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""" GLUT callback to redraw OpenGL surface
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"""
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glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
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# rotate it around the y axis
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glRotatef(self.viewangle_h,0.,0.,1.)
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glRotatef(self.viewangle_v,0.,1.,0.)
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self.recursive_render(self.scene.rootnode)
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glutSwapBuffers()
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self.do_motion()
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return
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def render(self, filename=None, fullscreen = False, autofit = True):
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####################################################################
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## GLUT keyboard and mouse callbacks ##
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####################################################################
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def onkeypress(self, key, x, y):
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if key == 'c':
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self.fit_scene(restore = True)
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self.set_camera(self.cycle_cameras())
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if key == 'q':
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sys.exit(0)
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def onspecialkeypress(self, key, x, y):
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fraction = 0.05
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if key == GLUT_KEY_UP:
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self.dp = 0.5
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if key == GLUT_KEY_DOWN:
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self.dp = -0.5
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if key == GLUT_KEY_LEFT:
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self.drot = -0.01
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if key == GLUT_KEY_RIGHT:
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self.drot = 0.01
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def onspecialkeyrelease(self, key, x, y):
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if key == GLUT_KEY_UP:
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self.dp = 0.
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if key == GLUT_KEY_DOWN:
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self.dp = 0.
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if key == GLUT_KEY_LEFT:
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self.drot = 0.0
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if key == GLUT_KEY_RIGHT:
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self.drot = 0.0
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def onclick(self, button, state, x, y):
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if button == GLUT_LEFT_BUTTON:
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if state == GLUT_UP:
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self.drot = 0
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self.x_origin = -1
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else: # GLUT_DOWN
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self.x_origin = x
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def onmousemove(self, x, y):
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if self.x_origin >= 0:
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self.drot = (x - self.x_origin) * 0.001
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def render(self, filename=None, fullscreen = False, autofit = True, postprocess = None):
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"""
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:param autofit: if true, scale the scene to fit the whole geometry
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@ -322,20 +364,24 @@ class GLRenderer():
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print("Fullscreen mode not available!")
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sys.exit(1)
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self.load_dae(filename, postprocess = postprocess)
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self.load_dae(filename)
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glClearColor(0.1,0.1,0.1,1.)
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#glShadeModel(GL_SMOOTH)
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glEnable(GL_LIGHTING)
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glClearColor(0.,0.,0.,1.)
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glShadeModel(GL_SMOOTH)
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glEnable(GL_CULL_FACE)
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glEnable(GL_DEPTH_TEST)
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glEnable(GL_LIGHTING)
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lightZeroPosition = [10.,4.,10.,1.]
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lightZeroColor = [0.8,1.0,0.8,1.0] #green tinged
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glLightfv(GL_LIGHT0, GL_POSITION, lightZeroPosition)
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glLightfv(GL_LIGHT0, GL_DIFFUSE, lightZeroColor)
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glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 0.1)
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glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, 0.05)
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#lightZeroPosition = [10.,4.,10.,1.]
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#lightZeroColor = [0.8,1.0,0.8,1.0] #green tinged
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#glLightfv(GL_LIGHT0, GL_POSITION, lightZeroPosition)
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#glLightfv(GL_LIGHT0, GL_DIFFUSE, lightZeroColor)
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#glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 0.1)
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#glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, 0.05)
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glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE)
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glEnable(GL_NORMALIZE)
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glEnable(GL_LIGHT0)
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glutDisplayFunc(self.display)
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@ -345,11 +391,7 @@ class GLRenderer():
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glLoadIdentity()
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gluPerspective(35.0, width/float(height) , 0.10, 100.0)
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glMatrixMode(GL_MODELVIEW)
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glLoadIdentity()
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gluLookAt(0.,0.,3., # pos
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0.,0.,0., # look at
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0.,1.,0.) # up vector
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self.set_default_camera()
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if autofit:
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# scale the whole asset to fit into our view frustum·
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@ -357,10 +399,16 @@ class GLRenderer():
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glPushMatrix()
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# Register GLUT callbacks for keyboard and mouse
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glutKeyboardFunc(self.onkeypress)
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glutSpecialFunc(self.onspecialkeypress)
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glutIgnoreKeyRepeat(1)
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glutSpecialUpFunc(self.onspecialkeyrelease)
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glutMouseFunc(self.onclick)
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glutMotionFunc(self.onmousemove)
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glutMainLoop()
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return
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if __name__ == '__main__':
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@ -369,5 +417,5 @@ if __name__ == '__main__':
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sys.exit(0)
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glrender = GLRenderer()
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glrender.render(sys.argv[1], fullscreen = False)
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glrender.render(sys.argv[1], fullscreen = False, postprocess = aiProcessPreset_TargetRealtime_MaxQuality)
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