Indigo Renderer Forum

So..is it possible to create a procedural scratch map using the indigo shader language? Does anyone want to take a shot at creating one? Ono...can you help out here?

It would be quite wonderful

Search before posting thanks

Tay Zonday err I mean Ono Sendai has already made it. Don't know if it renders properly with available version

http://www.indigorenderer.com/joomla/fo ... 8&start=75

sorry if i dont agree with you deus, but thats not what i think of when i hear scratch map. scratch map to me would be a bunch of random scratches in some random directionsn -- certainly not covering the entire object. more like typical wear and tear. great suggestion whaat. sounds like tricky math to me :0

A purely procedural scratch map as described by cpfresh would be quite tricky, I think. However I think it could be done using a source texture of a scratch, perhaps repeated randomly over the surface.

thanks ono...cpfresh got it right.

methinks we need a random number generator in the indigo shader language.

Whaat: there's functions for generating procedural noise.

To be honest the BEST way of using procedurals is to add high frequency information to textures. What I mean you have the basic shapes in the texture and modulate it using procedurals.

Maybe one can declare pairs of points on a surface within a given UV range (length of scratches), then interpolate UVs from one to the other. If sample is on marked UV (+/- scratch width), then draw scratch color.

Or draw a point and stretch its UVs...

You might want to take a look at the procedural scratch maps that are achievable with DarkTree Textures. Maybe someone can guess how that algorithm works and reverse-engineer something similar.

I know a few tricks for making scratch maps in the Renderman shading language. Maybe some of them will carry over to Indigo...

Whaat, are there plans to incorperate ono's new shaders into the next skindigo release?