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IDProjectCategoryLast Update
0027959Heart Of The MachineGraphical BugJul 31, 2023 1:41 pm
ReporterChris_McElligottPark Assigned ToChris_McElligottPark  
Status resolvedResolutionfixed 
Fixed in Version0.404 
Summary0027959: Note to self: experiment with fog shader optimizations.
DescriptionSomething for much later.

There are 4 quick optimizations you can make if the fog is used for VR or Mobile:

Disable Noise calculations
Disable Directional calculations
Disable Skybox fog if the fog is already added to the skybox
Disable Falloff which will disable all Power calculations which might be expensive on mobile or VR

Note: I can get the noise out easily, but skybox fog might require me to code an adjustment to skybox shaders. Directional calculations are important so worth the cost. Falloff I am not sure, I may be able to design around that.
TagsNo tags attached.



Jul 31, 2023 1:41 pm

administrator   ~0067860

Sigh, I went ahead and did this as well. I didn't want to risk things looking different later.

For the record, I made more optimizations than simply using those defines, as the shader code was still doing useless work when the defines were in use.

I disabled the noise calculations, which I wasn't using anyway, and also the code that calcualated their precursor data.

I then also disabled falloff, which I was not using in any meaningful way; I can't tell any difference between the two options in any of the lighting models, but the lack of the pow function is a big savings.

As noted, I have no intention of disabling the directional calculations. And for the skybox fog, I have no idea how to disable that and work around the artifacts it generates. I strongly suspect any workaround I implemented would be more costly than simply using that fog.

Issue History

Date Modified Username Field Change
Jul 30, 2023 3:52 pm Chris_McElligottPark New Issue
Jul 31, 2023 1:41 pm Chris_McElligottPark Assigned To => Chris_McElligottPark
Jul 31, 2023 1:41 pm Chris_McElligottPark Status new => resolved
Jul 31, 2023 1:41 pm Chris_McElligottPark Resolution open => fixed
Jul 31, 2023 1:41 pm Chris_McElligottPark Fixed in Version => 0.404
Jul 31, 2023 1:41 pm Chris_McElligottPark Note Added: 0067860