LuxCoreRender Forums

Hi,

I just noticed that If I use Mix Material, rendering doesn't show bump properly with OpenCL. With CPU, it works as expected.

That is because for opencl you have to put bump into mix material bump input

Egert_Kanep wrote: ↑Tue Apr 30, 2019 7:12 am That is because for opencl you have to put bump into mix material bump input

Yup, it is one of the very few features not supported by GPU rendering: it doesn't support mix/coating/etc. of bump/normal mapping.

This is likely to be added in v2.3, just ping me if I forget.

Egert_Kanep wrote: ↑Tue Apr 30, 2019 7:12 am That is because for opencl you have to put bump into mix material bump input

Thanks for the response. I have a question though. How do you control the mix factor when you use mix material bump input?

Taka wrote: ↑Tue Apr 30, 2019 4:28 pm How do you control the mix factor when you use mix material bump input?

You use a mix texture (Add -> Utils -> Math, switch to "Mix") like in the following setup:

Perfect! Thanks B.Y.O.B.!

By the way, could LuxCore do this internally to hide this problem from the user?

B.Y.O.B. wrote: ↑Tue Apr 30, 2019 6:30 pm By the way, could LuxCore do this internally to hide this problem from the user?

I doubt, you could have all kind of chains of mix(s) with all kind of bump/no bump combinations. I doubt it is possible to sort out the thing automatically; it would require to dynamically generate images with all connected problems (i.e. at what resolution, etc.). It is probably easier to just add complete bump support to OpenCL recursive materials