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how can I optimize render times?
Hey guys,
I’m fairly new to the 3D scene so please bear with me if I am missing some fairly obvious points. Recently I modeled a robot, which I think of as my first “proper” model. It consists of mainly basic primitive shapes that I’ve manipulated using deformers, extruding and moving a few points here and there. The materials are pretty basic, mainly glossy-reflective surfaces with a few bump maps and a couple of transparent glass materials.
The scene consists of just the robot, a floor, a sky and several lights.
Now, when I render a 1280×800 image with best anti-alias, ambient occlusion on and no effects, it takes about 20 minutes (without global illumination on) which I am quite happy with. However when I add an HDR image to my sky then choose to render it out using the same settings except with GI turned on and the lights disabled (but now I have turned off ambient occlusion) the render time shoots up to…..well, what can I say. it’s still rendering. It just passed 21hours and counting, and it is still at the “rendering prepass” stage. Although it looks like its almost done plotting those points. Now I know that global illumination tends to make renders a lot longer, but this long? Does this sound unusual or is this normal?
It seems ridiculous but I cannot see where I have gone wrong.
My GI settings are on: standard,
100% strength
70% accuracy
diffuse depth 3
stochastic samples 300
Min res. 50
Max res. 200I have a pretty standard machine – Macbook OSX 10.5.6, Intel Core 2 Duo 2.4GHz, 2GB ram and 160GB HD.
Maybe I have missed something really obvious but as of now I don’t have a clue. Please, any thoughts or suggestions on why this is taking so long, and if so, a way of reducing the rendering time would be greatly appreciated.
Regards,
your frustrated C4D newbie.
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2 Replies
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GI takes a while, it’s never fast. However, the Help has a bunch of hints about how to speed things up that can really work, it takes some practice though.
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Diffuse depth is killing you. Try ‘1’ and see if the results look good enough for you.
Cut the stochastic simples in half. If you find it still looks good, good for you.
GI takes too long to render anyway:)
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