Slowdown when using BumpMap

Corona Corona for Cinema 4D Issues
1

Hi

I’m not sure if this is connected to the latest daily, threadripper processor or something else.
When I render something with a material applied that includes bump map, my CPU is using less than 100% of its power (depends on scene, in this case less than 50%)
Noise in bump slot renders fine, as well as normal map.

It happened in every scene I opened today.

Win 10
R20
Latest daily

Issue.jpg
Issue.jpg2341×1980 617 KB

2

Hello,

just to make sure we’re on the same page:
A) - texture (e.g. noise) placed directly in the bump channel; rendering at sub 100% CPU usage
B) - texture (e.g. normal bitmap) placed under Corona Normal, which is then placed in the bump channel; rendering at 100% CPU usage

Is this correct?

Thanks,
Jan

3

Hi Jan

I did some more testing.

Texture or native C4D stuff like fresnel-shader, color-shader or all other C4D shaders I tested (except noise) in bump slot = less than 100% CPU usage. (in some cases around 70%, sometimes 30%)
Noise or Corona normal-shader + normal map in bump slot = 100% CPU usage.

Thanks!
Issue_Bump.zip (2.59 MB)