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Ideas
4.3 Shader Keywords support
This is a bigger thing I know but perhaps start with the Blending block?
Simple example is a shader that has the RGB in the Diffuse and A into Alpha,
With a drop down we could change the blend mode and disable the A link?
Answer
Possibly, it's quite a massive thing to implement, as I would have to restructure almost everything in order to get it to work properly. If lots of people vote this up I'll consider implementing it :)
Yup I can imagine.. I was actually thinking that in the nodes this might be easier, at least conceptually.. A Keyword Node. be able to insert it at the end of a block of nodes for example..
Texture2D (SpecMap)
Color (SpecColor)
Multiply Tex2D with Color
KeywordNode (Specular On/Off)
Its a bit like a IF node, if the keyword is on - use the previous nodes, if the keyword is odd, break the connection.
I can imagine it is a LOT of work for the shader itself but then you would have an awesome ubershader :)
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Possibly, it's quite a massive thing to implement, as I would have to restructure almost everything in order to get it to work properly. If lots of people vote this up I'll consider implementing it :)