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Cycles: Optimization for black world backgrounds

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* If a Background node is set to a black color or zero strength,
it now gets removed from the shader graph.

* In case the graph is empty (no background node), the kernel will skip
evaluating it and save some rendertime. This can help quite a bit in scenes,
where the majority of the image consists of a black background.

Example: http://www.pasteall.org/pic/show.php?id=82650
In this case the render is ~16% faster.

Differential Revision: https://developer.blender.org/D972
This commit is contained in:
Thomas Dinges
2015-01-21 20:06:53 +01:00
parent 7165db53f2
commit cd72396797
4 changed files with 43 additions and 11 deletions
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22
intern/cycles/render/graph.cpp
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@@ -374,6 +374,28 @@ void ShaderGraph::remove_unneeded_nodes()
removed[proxy->id] = true;
any_node_removed = true;
}
else if(node->special_type == SHADER_SPECIAL_TYPE_BACKGROUND) {
BackgroundNode *bg = static_cast<BackgroundNode*>(node);
if(bg->outputs[0]->links.size()) {
/* Black color or zero strength, remove node */
if((!bg->inputs[0]->link && bg->inputs[0]->value == make_float3(0.0f, 0.0f, 0.0f)) ||
(!bg->inputs[1]->link && bg->inputs[1]->value.x == 0.0f)) {
vector<ShaderInput*> inputs = bg->outputs[0]->links;
foreach(ShaderInput *sock, bg->inputs) {
if(sock->link)
disconnect(sock);
}
foreach(ShaderInput *input, inputs)
disconnect(input);
removed[bg->id] = true;
any_node_removed = true;
}
}
}
else if(node->special_type == SHADER_SPECIAL_TYPE_MIX_CLOSURE) {
MixClosureNode *mix = static_cast<MixClosureNode*>(node);