OSL - Random UV Mapping

[kcpr-raffaEl]

I'm wondering if there is possibility to randomize texture coordinates?

Maybe using OSL?

[roeland]

A good starting point is to create an OSL Projection node.

The default looks like this, and implements UV mapping:

Code: Select all

shader OslProjection(
    output point uvw = 0)
{
    uvw = point(u, v, 0);
}

You can also implement world space linear mapping:

Code: Select all

shader OslProjection(
    output point uvw = 0)
{
    uvw = P;
}

To implement something similar as the offset texture of the Turbulence node, add a color input and add it to the UV coordinate. Then add eg. a noise texture to that input:

Code: Select all

shader OslProjection(
    color offset = 0,
    float amount = 1 [[float min = 0.01, float max = 10, float sliderexponent = 4]],
    output point uvw = 0)
{
    uvw = P + amount * offset;
}

--
Roeland

[kcpr-raffaEl]

Thank you!

I'll be more specific.

I need to randomize RGB Image U and V translation for hundreds of object instances.
Like ceramic tiles with one texture but randomly distributed on each one.

Earlier I did it using Uunwrap, but maybe it's easier to randomize it with OSL?

[J.C]

What about random texture rotation? Can it be done in OSL too?