Randomizing Shader Parameters with Instance node

[xDreamer]

Hi all,

I want to randomize Material parameters with Instance node. I tried several methods including instancepoint() function but no luck. any idea how to do it ?

I attached simple scene to thread.

Thanks

material_instance.hipnc

Edited April 26, 2009 by xDreamer

[anim]

here is a very fast example

look at the material tab of the sphere object

trere is material parameter override used on base color of the clay material

and it uses pointinstance expression to get the random color for each point

you can use this expression directly on material parameters, but I chose the override way here

material_instance_example.hipnc

[xDreamer]

here is a very fast example

look at the material tab of the sphere object

trere is material parameter override used on base color of the clay material

and it uses pointinstance expression to get the random color for each point

you can use this expression directly on material parameters, but I chose the override way here

Thanks,

I was trying to use instancepoint in SOP level Which was wrong !

[anim]

Thanks,

I was trying to use instancepoint in SOP level Which was wrong !

according to instancepoint() help:

"You can not use this function at the surface level, because instancing only works at the object level."

this is kind of logical, because SOPs change geometry and instancing is based on the idea that there is only one geometry held in memory and is used for every instance with some variations(transforms, materials) applied on top. So any sop change based on instancepoint would necessairly create a geometry copy in memory which will ruin the whole effectivity of instancing and will be the same as copystamping technique.