jMonkeyEngine / jMonkeyEngine/jmonkeyengine
Performance issue with DiffuseMap/DiffuseColor & directional light/shadow map
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- Dominant language
- Java
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- Merged PRs (30d)
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Description
The bug is when two objects exist in the same viewport with two different material schemes fps goes from 60fps to 29fps (for me):
- Scene has directional light with a shadow map
- Scene has two objects: 1 object is DiffuseMap and the other is Diffuse (color)
Just copying over from Forum topic: http://hub.jmonkeyengine.org/t/settexture-diffusemap-way-faster-than-setcolor-diffuse/31066/3
Test case
See gist: https://gist.github.com/andychase/be168144ce117c653b5a
- Needs: Textures/planter.png
- press "Z" and "X" to switch on/off
Workaround
In the mean time you can use the DirectionalShadowFilter with a FilterPostProcessor. It doesn't exhibit the issue and you should have the same visual result.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked gist test case, using Textures/planter.png and the Z/X controls to reproduce the FPS drop. Compare a scene with a directional light and shadow map containing DiffuseMap and Diffuse-color materials, then compare the DirectionalShadowFilter workaround. Done means the mixed-material scene no longer shows the reported performance regression while retaining the same visual result.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- computer-graphics, performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100