Shadows become slow when enabling Bloom Filter

Scripting Issues
1

Hi, everyone!

I’ve got a problem, which I’m not able to deal with for some time.

I have a Spotlight sun, moving along Motion Path arch exported from Blender - like the real Sun. And I have a Train and the main camera, which are moving along the game world with high speed. The sun is a shadow caster, and shadows are just basic Panda3D shadows for now.

Everything works fine until I’m adding Bloom Filter:

filters = CommonFilters(base.win, base.cam)
filters.setBloom(size="large", mintrigger=0.8, intensity=2)

In that moment shadows become slowly:

Python37 Screenshot 2021.01.07 - 12.37.37.59
Python37 Screenshot 2021.01.07 - 12.37.37.591920×1080 1.27 MB

If I’ll slow the Train down, the shadows become normal, but on high speed it looks like shadows are rendered with a delay - the tree is already moved several pixels to the left along the screen, but the shadow is still on the old position - it doesn’t even start at the same position (I’ve set higher contrast on the screenshot to make it easier to see).

Did you ever see something similar, is there a way to fix it? I’d like to use both Bloom Filter and shadows. Thanks in advance!

2

Yes, it’s an issue with the sorting of the buffers. The default sort of CommonFilters is -1000, but the default sort of the shadow buffers is -10, which will cause the shadows to be rendered after the main scene.

You can pass sort=-2000 to the setShadowCaster call to fix this issue. A future version of Panda3D will change the default sort value of CommonFilters to fix this problem.

1 Like
3

Nice, it’s working. Thank you very much!