nParticle Texture-Driven Color to V-Ray

[mike_verta]

I don't understand why I'm struggling with this. Can someone break down the procedure for me?

I'm emitting nParticles from a surface with a V-Ray Material assigned to it. I want the particles to inherit the texture/material. Per-particle color attributes only update the viewport and don't render. And they don't appear to be displaying the texture precisely, anyway.

Would appreciate an assist if you've got one!

Thanks!

[hermit.crab]

Step by step with a very simple setup:
1. Create a polyPlane
2. Set it as an emitter (nParticles>Emit from object)
3. Set Emitter type to Surface
4. Adjust other parameters as you wish
5. In the nParticleShape go to "Add Dynamic Attributes" and add Color and Opacity Per Particle Attributes
6. In the general Attributes rollout, go to V-Ray and Add Per Point Particle Attribute Export and choose RGB (and opacity)
7. In the Emitter's Texture Emission Attributes, set a texture to the Particle Color and check the Inherit Color option
8. Select the nParticlesShape and apply a VRayMtl, in i.e. the diffuse slot of which plug a particleSamplerInfo node
9. Optional: Apply another VRayMtl to the source object, which has the same texture as the Emitter's particle color
10. Render

[mike_verta]

Step 6 and Step 8 were the gold, here. That's what I was missing. I will try this now. Thanks so much!

[mike_verta]

It is working - but I'm curious how I can pass an Opacity Scale ramp? It works in the viewport, obviously, but isn't passing to the VRayMtl - I tried putting a samplerInfo node in the Mtl's Opacity map, but no luck.

[hermit.crab]

It is working - but I'm curious how I can pass an Opacity Scale ramp? It works in the viewport, obviously, but isn't passing to the VRayMtl - I tried putting a samplerInfo node in the Mtl's Opacity map, but no luck.

Open Hypershade and manually plug the Opacity PP into all three of the VRayMtl's Opacity Map channels (simply drag-n-dropping will plug the Out Color). Make sure the opacity per-particle attribute export is active (in the V-Ray extra attribute).

[mike_verta]

That worked. Thank you!