Points intersect only on the Red and opening particle and surface normal points

[CinnamonMetal]

The geometry has red and black color, the points coming in are particles; I only want the particles to intersect with the parts of the geometry which are red. The parameter is to control if I want some particles to bleed into the black areas of the geometry.  Although neither is working, the particles are intersecting with both the black and red parts of the geometry ?

As well, I want to open the point clouds based on the dot product of the particle normal and the surface normal, I'm assuming I should use the UVW of the intersect for the position and the primitive of the intersect as the maxpoints, which I can then control the radius of how many points I want to open ?

 

[CinnamonMetal]

How do I get points to only effect the @Cd.r of the geometry; the current way is not working; the intersect is casting rays on the whole geometry regardless of the color on the geometry ?

[DonRomano]

Use a compare node to check if the @Cd.r is greater than your threshold value, and then drive a switch with that so it should cast rays only on the red geo :

 

[CinnamonMetal]

1 hour ago, DonRomano said:

Use a compare node to check if the @Cd.r is greater than your threshold value, and then drive a switch with that so it should cast rays only on the red geo :

 

The points continue to project on the black as well as the red.

[DonRomano]

What about sharing your file ? We'll be able to see what's not working and not wasting our breath here. It may come from another node..

 

Cheers, 

[CinnamonMetal]

Fluid_Liquid_Sphere.hipnc

I kept the attributevop network from your post; rather then my own.

[DonRomano]

I don't understand what you're trying to achieve, what's your goal here. Do you want just some particles to slide on the red geometry and some other to keep their way or is it something completely different ? 

[CinnamonMetal]

I want the particles to slide only on the parts of the geometry which are red, not the black areas, but using a parameter having some control whether some of the particles bleed into the semi-black areas is required. 

[nuki]

you could delete the poits with Cd.r<0.001 first, then intersect and use Cd.r as Alpha or pscale value. If you want to keep the black points you can skip the intersect like romain showed.

Edited April 7, 2020 by nuki

[CinnamonMetal]

The point have no color on them, only the geometry, are you saying to transfer the Cd.r from the geometry to the points; the points still won't confine to the red areas of the geometry; as well as I want that bleed.

[Librarian]

maybe it helps just play with that ..H 16.5

 

Fluid_Liquid_Spheremayb0.hipnc