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AppGameKit Classic Chat / Adding fog to shaders

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nz0
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Posted: 16th Dec 2017 21:26
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So I added



to my pixel shader and updated the final colour



and this works. However, it applies a uniform fog to the whole object, presumably because PosVarying is just the co-ord of the object, when I would want it to be the co-ord of the pixel.
Do I need to do something with the lighting as well?


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nz0
AGK Developer
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Posted: 16th Dec 2017 23:38
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It was the light
I added GetVSLighting() to the vertex shader and its all good.
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janbo
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Posted: 17th Dec 2017 01:10
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Fog should work without any light at all
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nz0
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Posted: 17th Dec 2017 23:35
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The fog did work, but the lighting overall was wrong and it looked like the fog needed it.
In fact it's still wrong, but I can pass the global light value into the shader and affect the brightness in some way which is probably wrong, but gives the right results.

My actual problem was that I wanted fog to affect my shaded object differently than the other objects because of it's bigger size.
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fubarpk
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Posted: 12th Feb 2018 05:53
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Ive found shaders can use allot of resources, I do love them tho
but I figure if you just want fog I created this effect very simply with a large sprite
that was basically a circle hundred percent transparent in the centre and dithered black off towards
the sides

http://users.tpg.com.au/subarpk/blackCircle.png

moving this around was much faster than using a shader and was better for android devices
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PHeMoX
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Posted: 26th Mar 2018 17:17
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Quote: "
My actual problem was that I wanted fog to affect my shaded object differently than the other objects because of it's bigger size. "


You can do that. Just apply the regular default shaders to objects that should be affected by fog the normal way and add a different shader to whatever big object in the distance should behave differently.
You could still add the ApplyFog stuff, but change it's strength or position I guess!
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