Shader request

[delle]

Hi to all, I'd like to learn Indigo Shading Language.

Since there is no tutorial available except the API Reference, I ask to some good fellow to try to help me to develop the shader that created this Picture "Shader.jpg". (of course not created with Indigo)

It uses one texture (Texture_Decal.png) to blend two different textures (Texture_01.png and Texture_02.png). The result is used for the Diffuse Albedo.

Note: I don't want to blend two different materials with a texture, I want to create a new triplet (RGB) to use it as albedo, bump, displace... with a shader.

I know that I can blend two materials but I want to learn ISL

Thank you.

Delle

[MSUdom5]

Hi delle,

This one is pretty simple and can be achieved with this code:

Code: Select all

def blend(vec3 tex1, vec3 tex2, real blendamt) vec3: add(mul(tex1,blendamt),mul(tex2,sub(1.0,blendamt)))

def eval(vec3 pos) vec3 : blend(sample2DTextureVec3(0,getTexCoords(0)), 
                                               sample2DTextureVec3(1,getTexCoords(0)),
                                               doti(sample2DTextureVec3(2, getTexCoords(0))))

Basically, the blend function returns a new rbg vector with the blended color. It samples the two rbg textures, and returns a combination of the two based on the "decal" texture.

And with ISLPreviewer, you can try things like this quickly.

[CTZn]

Awesome, dude !

What about adding buttons in the texture manager to change textures positions (or click'n'drag over new positon) ? Maybe not usefull for simple shaders, but if it's a complex one, that could save some hassle I guess.

Low priority req anyway

(doh I thought I was in the islp thread )

[delle]

Thank you MSUdom5!

Delle

[Kram1032]

nice