Hi everyone. I have a Karma setup. I imported Rbd sim with RbdProcedural and created a karma material.
My rock objects has float @range attribute distributed from 0 to 1.I imported range attribute
with "usdprimvarreader" and connect it to a ramp.I can see the colors in render gallery
and viewport. When I tried to open in Mplay or export it as exr I got completely different result.

It WORKS
When I disconnect ramp parameter from base color my viewport and output exr are same as shader color.

I tried both karma material builder and mtlx material builder with different ramps.
I tried mtlxgeompropvalue and mtlxUsdPrimvarReader.Also I tried H21.0.512 and H21.0.559 with
Nvidia 591.74 and 591.44.


Any help or pointer is appreciated. I am trying to fix this for the last 3 days.

Instead of the ramp parm, try the Karma Constant Ramp VOP (https://www.sidefx.com/docs/houdini/nodes/vop/kma_rampconst.html), see if that works for you.

Hi thanks for the reply. But I have already tried that one and MtlX Color Ramp VOP node and MtlX Ramp VOP node.