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Merge pull request #1194 from mikeucfl/gltf-multitextures

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gLTF Multitextures
This commit is contained in:
Alessandro Muntoni 2022-02-03 17:55:10 +01:00 committed by GitHub
commit cd64cb5f31
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 61 additions and 17 deletions
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78
src/meshlabplugins/io_gltf/gltf_loader.cpp
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@ -300,7 +300,8 @@ void loadMeshPrimitive(
progress.setStep(oldStep/GLTF_ATTR_STR.size()+1);
int textureImg = -1; //id of the texture associated to the material
bool vCol = false; //used if a material has a base color for all the primitive
bool vCol = false; // used if a material has a base color for all the primitive
bool vTex = false; // used if a material has a texture
vcg::Color4b col; //the base color, to be set to all the vertices
if (p.material >= 0) { //if the primitive has a material
@ -321,17 +322,34 @@ void loadMeshPrimitive(
}
}
if (textureImg != -1) { //if we found a texture
vTex = true;
const tinygltf::Image& img = model.images[model.textures[textureImg].source];
//add the path of the texture to the mesh
std::string uri = img.uri;
uri = std::regex_replace(uri, std::regex("\\%20"), " ");
bool textureAlreadyExists = false;
if (img.image.size() > 0) {
if (img.bits == 8 || img.component == 4) {
QImage qimg(img.image.data(), img.width, img.height, QImage::Format_RGBA8888);
if (!qimg.isNull()){
QImage copy = qimg.copy();
m.addTexture(uri, copy);
if (uri.empty()) {
uri = "texture_" + std::to_string(textureImg);
}
QImage existingTexture = m.getTexture(uri);
if (existingTexture.isNull()) {
m.addTexture(uri, copy);
}
else {
//use the existing texture index
auto it = std::find(m.cm.textures.begin(), m.cm.textures.end(), uri);
textureAlreadyExists = it != m.cm.textures.end();
if (textureAlreadyExists) {
textureImg = it - m.cm.textures.begin();
}
}
}
else {
m.cm.textures.push_back(uri);
@ -345,8 +363,12 @@ void loadMeshPrimitive(
//set to load later (could be format non-supported by tinygltf)
m.cm.textures.push_back(uri);
}
//set the id of the texture: we need it when set uv coords
textureImg = m.cm.textures.size()-1;
if (!textureAlreadyExists)
{
//set the id of the texture: we need it when set uv coords
textureImg = m.cm.textures.size() - 1;
}
}
//vector of vertex pointers added to the mesh
//this vector is modified only when adding vertex position attributes
@ -369,11 +391,17 @@ void loadMeshPrimitive(
//if the mesh has a base color, set it to vertex colors
if (vCol) {
mask |= vcg::tri::io::Mask::IOM_VERTCOLOR;
m.enable(vcg::tri::io::Mask::IOM_VERTCOLOR);
m.updateDataMask(MeshModel::MM_VERTCOLOR);
for (auto v : ivp)
v->C() = col;
}
// if the mesh has a texture, enable texcoords to the mesh
if (vTex) {
m.updateDataMask(MeshModel::MM_VERTTEXCOORD);
m.updateDataMask(MeshModel::MM_WEDGTEXCOORD);
}
if (cb)
cb(progress.progress(), "Loading vertex normals");
//load all the other vertex attributes (ivp is not modified by these calls)
@ -394,14 +422,16 @@ void loadMeshPrimitive(
if (cb)
cb(progress.progress(), "Loading vertex colors");
res = loadAttribute(m, ivp, model, p, COLOR_0);
if (res)
if (res) {
mask |= vcg::tri::io::Mask::IOM_VERTCOLOR;
}
progress.increment();
if (cb)
cb(progress.progress(), "Loading vertex texcoords");
res = loadAttribute(m, ivp, model, p, TEXCOORD_0, textureImg);
if (res)
mask |= vcg::tri::io::Mask::IOM_VERTTEXCOORD;
if (res) {
mask |= vcg::tri::io::Mask::IOM_WEDGTEXCOORD;
}
progress.increment();
@ -411,6 +441,15 @@ void loadMeshPrimitive(
loadAttribute(m, ivp, model, p, INDICES);
progress.increment();
// if vTex was true, it means that we loaded texcoords, that have been transfered from vertex to
// wedges when loading triangle indices. Therefore, we can remove vertex texcoords and leave
// only wedges, which are the only that can be rendered with multiple textures in meshlab
// TODO: remove this mechanism whenever vertex texcoords allow to render multiple textures in
// vcg.
if (vTex) {
m.clearDataMask(MeshModel::MM_VERTTEXCOORD);
}
if (cb)
cb(progress.progress(), "Loaded all attributes of current mesh");
@ -562,11 +601,8 @@ void populateAttr(
populateVNormals(ivp, array, number); break;
case COLOR_0:
populateVColors(ivp, array, number, textID); break;
break;
case TEXCOORD_0:
m.enable(vcg::tri::io::Mask::IOM_VERTTEXCOORD);
populateVTextCoords(ivp, array, number, textID); break;
break;
case INDICES:
populateTriangles(m, ivp, array, number/3); break;
}
@ -643,18 +679,26 @@ void populateTriangles(
CMeshO::FaceIterator fi =
vcg::tri::Allocator<CMeshO>::AddFaces(m.cm, triNumber);
for (unsigned int i = 0; i < triNumber*3; i+=3, ++fi) {
fi->V(0) = ivp[triArray[i]];
fi->V(1) = ivp[triArray[i+1]];
fi->V(2) = ivp[triArray[i+2]];
for (int j = 0; j < 3; ++j) {
fi->V(j) = ivp[triArray[i+j]];
fi->WT(j).u() = fi->V(j)->T().u();
fi->WT(j).v() = fi->V(j)->T().v();
fi->WT(j).n() = fi->V(j)->T().N();
}
}
}
else {
CMeshO::FaceIterator fi =
vcg::tri::Allocator<CMeshO>::AddFaces(m.cm, ivp.size()/3);
for (unsigned int i = 0; i < ivp.size(); i+=3, ++fi) {
fi->V(0) = ivp[i];
fi->V(1) = ivp[i+1];
fi->V(2) = ivp[i+2];
for (int j = 0; j < 3; ++j) {
fi->V(j) = ivp[i+j];
fi->WT(j).u() = fi->V(j)->T().u();
fi->WT(j).v() = fi->V(j)->T().v();
fi->WT(j).n() = fi->V(j)->T().N();
}
}
}
}