bool MeshImporter::is_nice_mesh(COLLADAFW::Mesh *mesh) // checks if mesh has supported primitive types: lines, polylist, triangles, triangle_fans
{
COLLADAFW::MeshPrimitiveArray& prim_arr = mesh->getMeshPrimitives();
const std::string &name = bc_get_dae_name(mesh);
int hole_count = 0;
for (unsigned i = 0; i < prim_arr.getCount(); i++) {
COLLADAFW::MeshPrimitive *mp = prim_arr[i];
COLLADAFW::MeshPrimitive::PrimitiveType type = mp->getPrimitiveType();
const char *type_str = bc_primTypeToStr(type);
// OpenCollada passes POLYGONS type for <polylist>
if (type == COLLADAFW::MeshPrimitive::POLYLIST || type == COLLADAFW::MeshPrimitive::POLYGONS) {
COLLADAFW::Polygons *mpvc = (COLLADAFW::Polygons *)mp;
COLLADAFW::Polygons::VertexCountArray& vca = mpvc->getGroupedVerticesVertexCountArray();
for (unsigned int j = 0; j < vca.getCount(); j++) {
int count = vca[j];
if (abs(count) < 3) {
fprintf(stderr, "ERROR: Primitive %s in %s has at least one face with vertex count < 3\n",
type_str, name.c_str());
return false;
}
if (count < 0)
{
hole_count ++;
}
}
if (hole_count > 0)
{
fprintf(stderr, "WARNING: Primitive %s in %s: %d holes not imported (unsupported)\n", type_str, name.c_str(), hole_count);
}
}
else if (type == COLLADAFW::MeshPrimitive::LINES) {
// TODO: Add Checker for line syntax here
}
else if (type != COLLADAFW::MeshPrimitive::TRIANGLES && type != COLLADAFW::MeshPrimitive::TRIANGLE_FANS) {
fprintf(stderr, "ERROR: Primitive type %s is not supported.\n", type_str);
return false;
}
}
if (mesh->getPositions().empty()) {
fprintf(stderr, "ERROR: Mesh %s has no vertices.\n", name.c_str());
return false;
}
return true;
}
static shared_ptr <GLTF::GLTFPrimitive> ConvertOpenCOLLADAMeshPrimitive(
COLLADAFW::MeshPrimitive *openCOLLADAMeshPrimitive,
IndicesVector &primitiveIndicesVector)
{
shared_ptr <GLTF::GLTFPrimitive> cvtPrimitive(new GLTF::GLTFPrimitive());
// We want to match OpenGL/ES mode , as WebGL spec points to OpenGL/ES spec...
// "Symbolic constants GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, and GL_TRIANGLES are accepted."
std::string type;
bool shouldTriangulate = false;
switch(openCOLLADAMeshPrimitive->getPrimitiveType()) {
//these 2 requires transforms
case COLLADAFW::MeshPrimitive::POLYLIST:
case COLLADAFW::MeshPrimitive::POLYGONS:
// FIXME: perform conversion, but until not done report error
//these mode are supported by WebGL
shouldTriangulate = true;
//force triangles
type = "TRIANGLES";
break;
case COLLADAFW::MeshPrimitive::LINES:
type = "LINES";
break;
case COLLADAFW::MeshPrimitive::LINE_STRIPS:
type = "LINE_STRIP";
break;
case COLLADAFW::MeshPrimitive::TRIANGLES:
type = "TRIANGLES";
break;
case COLLADAFW::MeshPrimitive::TRIANGLE_FANS:
type = "TRIANGLE_FANS";
break;
case COLLADAFW::MeshPrimitive::TRIANGLE_STRIPS:
type = "TRIANGLE_STRIPS";
break;
case COLLADAFW::MeshPrimitive::POINTS:
type = "POINTS";
break;
default:
break;
}
cvtPrimitive->setMaterialObjectID((unsigned int)openCOLLADAMeshPrimitive->getMaterialId());
cvtPrimitive->setType(type);
//count of indices , it must be the same for all kind of indices
size_t count = openCOLLADAMeshPrimitive->getPositionIndices().getCount();
//vertex
//IndexList &positionIndexList = openCOLLADAMeshPrimitive->getPositionIndices();
unsigned int *indices = openCOLLADAMeshPrimitive->getPositionIndices().getData();
unsigned int *verticesCountArray = 0;
unsigned int vcount = 0; //count of elements in the array containing the count of indices per polygon & polylist.
if (shouldTriangulate) {
unsigned int triangulatedIndicesCount = 0;
//We have to upcast to polygon to retrieve the array of vertexCount
//OpenCOLLADA use polylist as polygon.
COLLADAFW::Polygons *polygon = (COLLADAFW::Polygons*)openCOLLADAMeshPrimitive;
const COLLADAFW::Polygons::VertexCountArray& vertexCountArray = polygon->getGroupedVerticesVertexCountArray();
vcount = (unsigned int)vertexCountArray.getCount();
verticesCountArray = (unsigned int*)malloc(sizeof(unsigned int) * vcount);
for (size_t i = 0; i < vcount; i++) {
verticesCountArray[i] = polygon->getGroupedVerticesVertexCount(i);;
}
indices = createTrianglesFromPolylist(verticesCountArray, indices, vcount, &triangulatedIndicesCount);
count = triangulatedIndicesCount;
}
shared_ptr <GLTFBufferView> positionBuffer = createBufferViewWithAllocatedBuffer(indices, 0, count * sizeof(unsigned int), shouldTriangulate ? true : false);
shared_ptr <GLTF::GLTFIndices> positionIndices(new GLTF::GLTFIndices(positionBuffer,count));
__AppendIndices(cvtPrimitive, primitiveIndicesVector, positionIndices, POSITION, 0);
if (openCOLLADAMeshPrimitive->hasNormalIndices()) {
unsigned int triangulatedIndicesCount = 0;
indices = openCOLLADAMeshPrimitive->getNormalIndices().getData();
if (shouldTriangulate) {
indices = createTrianglesFromPolylist(verticesCountArray, indices, vcount, &triangulatedIndicesCount);
count = triangulatedIndicesCount;
}
shared_ptr <GLTF::GLTFBufferView> normalBuffer = createBufferViewWithAllocatedBuffer(indices, 0, count * sizeof(unsigned int), shouldTriangulate ? true : false);
shared_ptr <GLTF::GLTFIndices> normalIndices(new GLTF::GLTFIndices(normalBuffer,
count));
__AppendIndices(cvtPrimitive, primitiveIndicesVector, normalIndices, NORMAL, 0);
}
if (openCOLLADAMeshPrimitive->hasColorIndices()) {
COLLADAFW::IndexListArray& colorListArray = openCOLLADAMeshPrimitive->getColorIndicesArray();
for (size_t i = 0 ; i < colorListArray.getCount() ; i++) {
COLLADAFW::IndexList* indexList = openCOLLADAMeshPrimitive->getColorIndices(i);
__HandleIndexList(i,
indexList,
GLTF::COLOR,
shouldTriangulate,
count,
vcount,
verticesCountArray,
cvtPrimitive,
primitiveIndicesVector);
}
}
if (openCOLLADAMeshPrimitive->hasUVCoordIndices()) {
COLLADAFW::IndexListArray& uvListArray = openCOLLADAMeshPrimitive->getUVCoordIndicesArray();
for (size_t i = 0 ; i < uvListArray.getCount() ; i++) {
COLLADAFW::IndexList* indexList = openCOLLADAMeshPrimitive->getUVCoordIndices(i);
__HandleIndexList(i,
indexList,
GLTF::TEXCOORD,
shouldTriangulate,
count,
vcount,
verticesCountArray,
cvtPrimitive,
primitiveIndicesVector);
}
}
if (verticesCountArray) {
free(verticesCountArray);
}
return cvtPrimitive;
}