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AppGameKit Classic Chat / [SOLVED] [Bug?] Object animation doesn't work with custom shader.

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Nieb
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Posted: 7th Aug 2018 07:49
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I can't get animations to work while using custom shaders. Am I doing something wrong?
Test project attached.
@_Nieb_

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Bengismo
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Posted: 7th Aug 2018 09:07 Edited at: 7th Aug 2018 09:08
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No its not a bug and yes your doing it wrong. 3D object animation is handled in the vertex shader.

If you replace the stock vertex shader then you have to include the stock animation shader code with it too which uses quaternions to work out the blended positions and normals. You can get the stock vertex shader code by using GetObjectMeshShader() - take a look at it and add the bits relating to positions and normals to your shader and you can have a fully animated reflection shader. (at least I think thats what your after)
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Santman
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Posted: 7th Aug 2018 17:46
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Model based animation isn't done in the vertex shader is it? Do animations not work with shadows then? Because they are calculated before the scene so any movement in the vertex shader isn't accounted for.
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janbo
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Posted: 7th Aug 2018 17:52
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@Santman
For the shadows you basically have a second shader set to render the depth into a render target which is then used to compare against the actual fragment depth.
So "yes" there is a step before rendering the actual object but "no" because you still use a vertex shader with the animation code in the previous step.
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Santman
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Posted: 7th Aug 2018 18:45
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Janbo, not sure what your saying yes too. Lol.

So, when I move, for example, tree branches and grass in the vertex shader the shadows don't move with them.....so why does animation??
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janbo
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Posted: 7th Aug 2018 19:27 Edited at: 7th Aug 2018 19:30
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If you do the branch animation in a custom shader, how can the previous step for the shadows know what you are about to do ?
If its the default vertex shader then it should be fine, if not ...you have no chance but creating a command set to pass custom depth images using the new Git Project
Or maybe alter my shadow shader I made some time ago
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Santman
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Posted: 7th Aug 2018 20:34
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That's my point.

Yeah, thank you for that link, still to look at it, but the AppGameKit shadows don't cut it for me anyway.....if something is too large vertically, the shadow cuts out when you move past it. Not sure I have the knowledge to fix that though.
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janbo
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Posted: 8th Aug 2018 21:30 Edited at: 8th Aug 2018 21:33
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What happens to your large object if you set it up with SetObjectScreenCulling( objID, 0 ) ?
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