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Added support for non-indexed meshes in glTF importer. Addresses issue #2046.

pull/2049/head
Paul Arden 2018-07-05 09:37:57 +10:00
parent 32abf9294a
commit e7699ca585
2 changed files with 146 additions and 0 deletions
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73
code/glTF2Importer.cpp
View File

@ -521,6 +521,79 @@ void glTF2Importer::ImportMeshes(glTF2::Asset& r)
ai_assert(CheckValidFacesIndices(faces, nFaces, aim->mNumVertices)); ai_assert(CheckValidFacesIndices(faces, nFaces, aim->mNumVertices));
} }
} }
else { // no indices provided so directly generate from counts
aiFace* faces = 0;
unsigned int nFaces = 0;
// use the already determined count as it includes checks
unsigned int count = aim->mNumVertices;
switch (prim.mode) {
case PrimitiveMode_POINTS: {
nFaces = count;
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; ++i) {
SetFace(faces[i], i);
}
break;
}
case PrimitiveMode_LINES: {
nFaces = count / 2;
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; i += 2) {
SetFace(faces[i / 2], i, i + 1);
}
break;
}
case PrimitiveMode_LINE_LOOP:
case PrimitiveMode_LINE_STRIP: {
nFaces = count - ((prim.mode == PrimitiveMode_LINE_STRIP) ? 1 : 0);
faces = new aiFace[nFaces];
SetFace(faces[0], 0, 1);
for (unsigned int i = 2; i < count; ++i) {
SetFace(faces[i - 1], faces[i - 2].mIndices[1], i);
}
if (prim.mode == PrimitiveMode_LINE_LOOP) { // close the loop
SetFace(faces[count - 1], faces[count - 2].mIndices[1], faces[0].mIndices[0]);
}
break;
}
case PrimitiveMode_TRIANGLES: {
nFaces = count / 3;
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; i += 3) {
SetFace(faces[i / 3], i, i + 1, i + 2);
}
break;
}
case PrimitiveMode_TRIANGLE_STRIP: {
nFaces = count - 2;
faces = new aiFace[nFaces];
SetFace(faces[0], 0, 1, 2);
for (unsigned int i = 3; i < count; ++i) {
SetFace(faces[i - 2], faces[i - 1].mIndices[1], faces[i - 1].mIndices[2], i);
}
break;
}
case PrimitiveMode_TRIANGLE_FAN:
nFaces = count - 2;
faces = new aiFace[nFaces];
SetFace(faces[0], 0, 1, 2);
for (unsigned int i = 3; i < count; ++i) {
SetFace(faces[i - 2], faces[0].mIndices[0], faces[i - 1].mIndices[2], i);
}
break;
}
if (faces) {
aim->mFaces = faces;
aim->mNumFaces = nFaces;
ai_assert(CheckValidFacesIndices(faces, nFaces, aim->mNumVertices));
}
}
if (prim.material) { if (prim.material) {

73
code/glTFImporter.cpp
View File

@ -426,6 +426,79 @@ void glTFImporter::ImportMeshes(glTF::Asset& r)
ai_assert(CheckValidFacesIndices(faces, nFaces, aim->mNumVertices)); ai_assert(CheckValidFacesIndices(faces, nFaces, aim->mNumVertices));
} }
} }
else { // no indices provided so directly generate from counts
aiFace* faces = 0;
unsigned int nFaces = 0;
// use the already determined count as it includes checks
unsigned int count = aim->mNumVertices;
switch (prim.mode) {
case PrimitiveMode_POINTS: {
nFaces = count;
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; ++i) {
SetFace(faces[i], i);
}
break;
}
case PrimitiveMode_LINES: {
nFaces = count / 2;
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; i += 2) {
SetFace(faces[i / 2], i, i + 1);
}
break;
}
case PrimitiveMode_LINE_LOOP:
case PrimitiveMode_LINE_STRIP: {
nFaces = count - ((prim.mode == PrimitiveMode_LINE_STRIP) ? 1 : 0);
faces = new aiFace[nFaces];
SetFace(faces[0], 0, 1);
for (unsigned int i = 2; i < count; ++i) {
SetFace(faces[i - 1], faces[i - 2].mIndices[1], i);
}
if (prim.mode == PrimitiveMode_LINE_LOOP) { // close the loop
SetFace(faces[count - 1], faces[count - 2].mIndices[1], faces[0].mIndices[0]);
}
break;
}
case PrimitiveMode_TRIANGLES: {
nFaces = count / 3;
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; i += 3) {
SetFace(faces[i / 3], i, i + 1, i + 2);
}
break;
}
case PrimitiveMode_TRIANGLE_STRIP: {
nFaces = count - 2;
faces = new aiFace[nFaces];
SetFace(faces[0], 0, 1, 2);
for (unsigned int i = 3; i < count; ++i) {
SetFace(faces[i - 2], faces[i - 1].mIndices[1], faces[i - 1].mIndices[2], i);
}
break;
}
case PrimitiveMode_TRIANGLE_FAN:
nFaces = count - 2;
faces = new aiFace[nFaces];
SetFace(faces[0], 0, 1, 2);
for (unsigned int i = 3; i < count; ++i) {
SetFace(faces[i - 2], faces[0].mIndices[0], faces[i - 1].mIndices[2], i);
}
break;
}
if (faces) {
aim->mFaces = faces;
aim->mNumFaces = nFaces;
ai_assert(CheckValidFacesIndices(faces, nFaces, aim->mNumVertices));
}
}
if (prim.material) { if (prim.material) {