Hi Marcus,
(First post 2006 ... Yay!)
Hi all! I hope you had a good holiday!
I'm having some problems merging chunk materials (more specifically,
replacing one chunk with another).
This is what I do currently:
class MergeMaterialFunctor {
...
void doEnter(ChunkMaterialPtr cm)
ChunkMaterialPtr m_material;
}
void MergeMaterialFunctor::doEnter(ChunkMaterialPtr cm)
{
const MFStateChunkPtr& chunks = m_material->getChunks();
const MFInt32& slots = m_material->getSlots();
CPEdit(cm, ChunkMaterial::ChunksFieldMask);
for (unsigned int i = 0; i < chunks.size(); ++i) {
int slot = i < slots.size() ? slots[i] : State::AutoSlotReplace;
if (StateChunkPtr oldchunk = cm->find(chunks[i]->getType(), slot)) {
cm->subChunk(oldchunk, slot);
}
cm->addChunk(chunks[i], slot);
}
}
The problem is that the chunk returned by findChunk(), (that is, the
oldchunk) sometimes (rarely, but repeatable) isn't found by subChunk().
It's probably a basic mistake, but I can't spot it and the
chunk/slot-pairing semantics are a bit complex.
Can you try to add begin/endEditCP around the cm->subChunk and
cm->addChunk perhaps this helps.
Any help welcome!
Best Regards,
/Marcus
P.S. In ChunkMaterial::find(), the ++index operation is inside the
if-clause. Is that really correct?
No that's correct it is a special undocumented feature. If you have
several chunks of the same type with a AutoSlotReplace slot in a
material you can search these via index.
Example:
MaterialChunkPtr chunk1 = MaterialChunk::create();
TextureChunkPtr chunk2 = TextureChunk::create();
BlendChunkPtr chunk3 = BlendChunk::create();
TextureChunkPtr chunk4 = TextureChunk::create();
TextureChunkPtr chunk5 = TextureChunk::create();
ChunkMaterialPtr cm = ChunkMaterial::create();
beginEditCP(cm);
cm->addChunk(chunk1);
cm->addChunk(chunk2, 3);
cm->addChunk(chunk3);
cm->addChunk(chunk4);
cm->addChunk(chunk5);
endEditCP(cm);
Now finding the texture chunk in slot 3 works as expected.
chunk2 == cm->find(TextureChunk::getClassType(), 3);
If you want to find a specific chunk with a AutoSlotReplace slot, the
slot parameter is interpreted as a index.
chunk4 == cm->find(TextureChunk::getClassType(), 1);
chunk5 == cm->find(TextureChunk::getClassType(), 2);
Andreas
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