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Merge pull request #2050 from Nimer-88/feature/glTFv2_blendshapes_support 

glTF v2 importer morph target support
pull/2049/head^2
Kim Kulling 2018-07-14 19:04:28 +02:00 committed by GitHub
parent 3c6ba8162b b069e7d7d0
commit 89190dda97
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 107 additions and 4 deletions
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7
code/glTF2Asset.h
View File

@ -766,10 +766,17 @@ namespace glTF2
Ref<Accessor> indices;
Ref<Material> material;
struct Target {
AccessorList position, normal, tangent;
};
std::vector<Target> targets;
};
std::vector<Primitive> primitives;
std::vector<float> weights;
Mesh() {}
/// \fn void Read(Value& pJSON_Object, Asset& pAsset_Root)

45
code/glTF2Asset.inl
View File

@ -931,6 +931,21 @@ namespace {
else return false;
return true;
}
inline bool GetAttribTargetVector(Mesh::Primitive& p, const int targetIndex, const char* attr, Mesh::AccessorList*& v, int& pos)
{
if ((pos = Compare(attr, "POSITION"))) {
v = &(p.targets[targetIndex].position);
}
else if ((pos = Compare(attr, "NORMAL"))) {
v = &(p.targets[targetIndex].normal);
}
else if ((pos = Compare(attr, "TANGENT"))) {
v = &(p.targets[targetIndex].tangent);
}
else return false;
return true;
}
}
inline void Mesh::Read(Value& pJSON_Object, Asset& pAsset_Root)
@ -965,6 +980,26 @@ inline void Mesh::Read(Value& pJSON_Object, Asset& pAsset_Root)
}
}
if (Value* targetsArray = FindArray(primitive, "targets")) {
prim.targets.resize(targetsArray->Size());
for (unsigned int i = 0; i < targetsArray->Size(); ++i) {
Value& target = (*targetsArray)[i];
if (!target.IsObject()) continue;
for (Value::MemberIterator it = target.MemberBegin(); it != target.MemberEnd(); ++it) {
if (!it->value.IsUint()) continue;
const char* attr = it->name.GetString();
// Valid attribute semantics include POSITION, NORMAL, TANGENT
int undPos = 0;
Mesh::AccessorList* vec = 0;
if (GetAttribTargetVector(prim, i, attr, vec, undPos)) {
size_t idx = (attr[undPos] == '_') ? atoi(attr + undPos + 1) : 0;
if ((*vec).size() <= idx) (*vec).resize(idx + 1);
(*vec)[idx] = pAsset_Root.accessors.Retrieve(it->value.GetUint());
}
}
}
}
if (Value* indices = FindUInt(primitive, "indices")) {
prim.indices = pAsset_Root.accessors.Retrieve(indices->GetUint());
}
@ -974,6 +1009,16 @@ inline void Mesh::Read(Value& pJSON_Object, Asset& pAsset_Root)
}
}
}
if (Value* weights = FindArray(pJSON_Object, "weights")) {
this->weights.resize(weights->Size());
for (unsigned int i = 0; i < weights->Size(); ++i) {
Value& weightValue = (*weights)[i];
if (weightValue.IsNumber()) {
this->weights[i] = weightValue.GetFloat();
}
}
}
}
inline void Camera::Read(Value& obj, Asset& /*r*/)

59
code/glTF2Importer.cpp
View File

@ -51,6 +51,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <assimp/ai_assert.h>
#include <assimp/DefaultLogger.hpp>
#include <assimp/importerdesc.h>
#include <assimp/CreateAnimMesh.h>
#include <memory>
@ -65,6 +66,13 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
using namespace Assimp;
using namespace glTF2;
namespace {
// generate bitangents from normals and tangents according to spec
struct Tangent {
aiVector3D xyz;
ai_real w;
};
} // namespace
//
// glTF2Importer
@ -416,10 +424,7 @@ void glTF2Importer::ImportMeshes(glTF2::Asset& r)
// only extract tangents if normals are present
if (attr.tangent.size() > 0 && attr.tangent[0]) {
// generate bitangents from normals and tangents according to spec
struct Tangent {
aiVector3D xyz;
ai_real w;
} *tangents = nullptr;
Tangent *tangents = nullptr;
attr.tangent[0]->ExtractData(tangents);
@ -445,6 +450,52 @@ void glTF2Importer::ImportMeshes(glTF2::Asset& r)
}
}
std::vector<Mesh::Primitive::Target>& targets = prim.targets;
if (targets.size() > 0) {
aim->mNumAnimMeshes = targets.size();
aim->mAnimMeshes = new aiAnimMesh*[aim->mNumAnimMeshes];
for (size_t i = 0; i < targets.size(); i++) {
aim->mAnimMeshes[i] = aiCreateAnimMesh(aim);
aiAnimMesh& aiAnimMesh = *(aim->mAnimMeshes[i]);
Mesh::Primitive::Target& target = targets[i];
if (target.position.size() > 0) {
aiVector3D *positionDiff = nullptr;
target.position[0]->ExtractData(positionDiff);
for(unsigned int vertexId = 0; vertexId < aim->mNumVertices; vertexId++) {
aiAnimMesh.mVertices[vertexId] += positionDiff[vertexId];
}
delete [] positionDiff;
}
if (target.normal.size() > 0) {
aiVector3D *normalDiff = nullptr;
target.normal[0]->ExtractData(normalDiff);
for(unsigned int vertexId = 0; vertexId < aim->mNumVertices; vertexId++) {
aiAnimMesh.mNormals[vertexId] += normalDiff[vertexId];
}
delete [] normalDiff;
}
if (target.tangent.size() > 0) {
Tangent *tangent = nullptr;
attr.tangent[0]->ExtractData(tangent);
aiVector3D *tangentDiff = nullptr;
target.tangent[0]->ExtractData(tangentDiff);
for (unsigned int vertexId = 0; vertexId < aim->mNumVertices; ++vertexId) {
tangent[vertexId].xyz += tangentDiff[vertexId];
aiAnimMesh.mTangents[vertexId] = tangent[vertexId].xyz;
aiAnimMesh.mBitangents[vertexId] = (aiAnimMesh.mNormals[vertexId] ^ tangent[vertexId].xyz) * tangent[vertexId].w;
}
delete [] tangent;
delete [] tangentDiff;
}
if (mesh.weights.size() > i) {
aiAnimMesh.mWeight = mesh.weights[i];
}
}
}
if (prim.indices) {
aiFace* faces = 0;