Change Niagara Template/Example to blood spilling from vein

[davide445]

Want to change this Template will try to define here the changes as soon i discovered something, also trying to get some hint from other more experts

• get rid of the pool disabling Emitter Update>Grid 3D FLIP Thank Spawn (got a compilation error but works)
• changed emission rate using Emitter Update>Spawn Rate 001
• changed emitter size in Particle Spawn>Sphere radius
• changed emitter height in Particle Spawn>Offset>Z

Now trying to change the color from blue water to blood red, in the Render>Mesh Renderer is enabled the Material Override option and the Explicit Mat is referring to the M_WaterSDF_Inst material.

Changing the Absorption and Base Color to red still I get out the blue water

I was able to change the blue darkness changing the Absorption alpha, but I’m not able to change the color.

[davide445]

Starting from the 3D Liquid Constant Emission example was trying to setup the collision with my custom mesh, and having

• detailed collider mesh defined
  
  
• “collider” tag set in the mesh Actor
• BlockAll collision preset set
• Collision Complexity is set as use Complex collision as Simple

Still no collision happen between the fluid and the mesh

[Michael.Galetzka (MGaletzka)]

Does the mesh have a correct physics collision and distance field?

[davide445]

I dind’t find anything wrong, but I didn’t explicitly generated the collison meshes so I suppose UE5 generated them importing the mesh
Simple collision

Complex collision

Mesh dinstance field

[davide445]

The collision happens if I generate a convex decomposition collider,

but this is too rough for my needs, and being the complex collision mesh available I dind’t understand why this one is not used

[davide445]

I finally discovered a way to make the collision work: need to add a Collision module to the Particle update (this add as a fix the Solve Forces and Velocity) but generate an actual collision only setting GPU Collision Type to “GPU Distance Field”, setting “Depth Buffer” or “Ray Traces” didn’t work

[davide445]

Next step is trying to change the color from water to blood. Now show like this

Tried tchanging M_WaterSDF_Inst Absorption and Base Color without any result

Changing Scattering and Base Color in M_WaterSDF parent material didn’t change anything either (what show are the default values, changing them didn’t change anything)