Do smaller textures render faster?

[aeolian001]

my scene has quite a lot of textures, most are 1024 up to 3000 pixels. if i were to reduce most of them to 512 would that increase render speed? Was curious if size of textures affects render speed and if anyone else has tested this.


thanks

[juanjgon]

I don't think that the texture size could affect the render performance. Perhaps big textures could need a bit more time to be loaded and filtered, but the render times should near be the same.

-Juanjo

[aeolian001]

thank you, good to know

[OlaHaldor]

I don't think I've pushed Octane to the limit, nor made very intense scenes. But I have made some experience with 2D planes with textures.
As I built the scene, render times didn't increase nor decrease, regardless of how many objects (all though single poly with 2K textures) I added.
There were about 150-200 objects in the end.


One frame on a GTX 780Ti (at the clients computer) took about 3 minutes with motion blur and nearly no noise, using the path tracing kernel, and the scene lit by the Environment: DayLight node.
It resulted in very nice and soft lighting, but slower frames obviously. I needed path tracing for some special lights and illuminating objects.


Faster or more GPUs helped increasingly. Especially as part of the sequence were to be in a "lightning took the power" situation and only a flashlight would lit the scene, resulting in tons of noise. Same rendertime as with the 780Ti on two GTX Titans, resulting in less noise, fixed that issue.