Having lots of fun with Finite Water on ShaderToy!

I am trying to port it to Vuo, however there are 2 buffers. To deal with this I simply made copies of ShaderToy, (Buffer A & Buffer B).

However there seems to be an alpha issue with the buffers, I am able to write to the buffer but then not delete material from it.

Composition attached.

Cheers, Alex

Working ShaderToy:

Not working Vuo:

ScreenShot Composition:

Comments

The issue is color depth.

jstrecker's picture
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The issue is color depth. Currently, the Make Image with Shadertoy renders at 8bpc, which is 8-bit unsigned numbers. But your shader is outputting negative colors — they get clamped to 0.

In Vuo 1.3, we'll add an input port for color depth with the option to switch to 16bpc, which is 16-bit signed numbers.

In the meantime, you could rework the math in the shader to output colors as non-negative numbers.

@glennmarshall, confirmed. I

jstrecker's picture
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glennmarshall, confirmed. I took alexmitchellmus's composition from above, simplified it for testing (notably, removed mouse input), and changed the Color Depth inputs on the Shadertoy nodes to 16bpc. The composition successfully outputs ripples, as opposed to the white blobs before the 16bpc option was added in Vuo 1.2.2. I changed a couple of constants that alexmitchellmus had modified back to the values in the original Shadertoy code. Now the Vuo composition output appears to match the Shadertoy demo. Composition attached.

Thanks Jaymie!!

glennmarshall's picture
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Thanks Jaymie!! I got that working in the trial version of Vuo. Brilliant! I'm currently trying to import another multi pass shader from Shadertoy - but I'm having a little problem with it - I've posted a question here.. https://vuo.org/node/1547

If I can solve that, then I'll definitely be buying Vuo for my project. Hope you can help, Glenn.