Child transforms problem when loading 3DS models using assimp
- by MhdSyrwan
I'm trying to load a textured 3d model into my scene using assimp model loader.
The problem is that child meshes are not situated correctly (they don't have the correct transformations).
In brief: all the mTansform matrices are identity matrices, why would that be?
I'm using this code to render the model:
void recursive_render (const struct aiScene *sc, const struct aiNode* nd, float scale)
{
unsigned int i;
unsigned int n=0, t;
aiMatrix4x4 m = nd->mTransformation;
m.Scaling(aiVector3D(scale, scale, scale), m);
// update transform
m.Transpose();
glPushMatrix();
glMultMatrixf((float*)&m);
// draw all meshes assigned to this node
for (; n < nd->mNumMeshes; ++n)
{
const struct aiMesh* mesh = scene->mMeshes[nd->mMeshes[n]];
apply_material(sc->mMaterials[mesh->mMaterialIndex]);
if (mesh->HasBones()){
printf("model has bones");
abort();
}
if(mesh->mNormals == NULL)
{
glDisable(GL_LIGHTING);
}
else
{
glEnable(GL_LIGHTING);
}
if(mesh->mColors[0] != NULL)
{
glEnable(GL_COLOR_MATERIAL);
}
else
{
glDisable(GL_COLOR_MATERIAL);
}
for (t = 0; t < mesh->mNumFaces; ++t) {
const struct aiFace* face = &mesh->mFaces[t];
GLenum face_mode;
switch(face->mNumIndices)
{
case 1: face_mode = GL_POINTS; break;
case 2: face_mode = GL_LINES; break;
case 3: face_mode = GL_TRIANGLES; break;
default: face_mode = GL_POLYGON; break;
}
glBegin(face_mode);
for(i = 0; i < face->mNumIndices; i++)// go through all vertices in face
{
int vertexIndex = face->mIndices[i];// get group index for current index
if(mesh->mColors[0] != NULL)
Color4f(&mesh->mColors[0][vertexIndex]);
if(mesh->mNormals != NULL)
if(mesh->HasTextureCoords(0))//HasTextureCoords(texture_coordinates_set)
{
glTexCoord2f(mesh->mTextureCoords[0][vertexIndex].x, 1 - mesh->mTextureCoords[0][vertexIndex].y); //mTextureCoords[channel][vertex]
}
glNormal3fv(&mesh->mNormals[vertexIndex].x);
glVertex3fv(&mesh->mVertices[vertexIndex].x);
}
glEnd();
}
}
// draw all children
for (n = 0; n < nd->mNumChildren; ++n)
{
recursive_render(sc, nd->mChildren[n], scale);
}
glPopMatrix();
}
What's the problem in my code ?
I've added some code to abort the program if there's any bone in the meshes, but the program doesn't abort, this means : no bones, is that normal?
if (mesh->HasBones()){
printf("model has bones");
abort();
}
Note: I am using openGL & SFML & assimp
