Only set particle position and rotation in script

Hello

I'm trying to make some bullet decals and I want to only set the particle's position and rotation through a script and leave size and color to the particle system itself. But I can't find a way to make the particle system give me the "proper" sizes and colors.

Here is my current code:

Code (CSharp):

1. decalParticles = new ParticleSystem.Particle[bulletDecals.main.maxParticles];
2. decalData = new BulletDecalData[bulletDecals.main.maxParticles];
3. for (int i = 0; i < bulletDecals.main.maxParticles; i++)
4. {
5.     decalData[i] = new BulletDecalData();
6. }
7.  
8. if (decalParticleDataIndex >= bulletDecals.main.maxParticles)
9.     decalParticleDataIndex = 0;
10.  
11. decalData[decalParticleDataIndex].position = hit.point + (hit.normal * 0.01f);
12. Vector3 particleRotationEuler = Quaternion.LookRotation(hit.normal).eulerAngles;
13. particleRotationEuler.z = Random.Range(0f, 360f);
14. decalData[decalParticleDataIndex].rotation = particleRotationEuler;
15.  
16. decalParticleDataIndex++;
17.  
18. for (int i = 0; i < decalParticles.Length; i++)
19. {
20.     decalParticles[i].position = decalData[i].position;
21.     decalParticles[i].rotation3D = decalData[i].rotation;
22.     //decalParticles[i].startSize = decalData[i].size;
23.     //decalParticles[i].startColor = decalData[i].color;
24. }
25.  
26. bulletDecals.SetParticles(decalParticles, decalParticles.Length);

This sets the position and rotation correctly, but I need a way to calculate the size and color (the commented lines). I could do it myself but when I did it, some random colors didn't mix like they do with the particle system, and all of these curves, I don't know how they work.

I've also tried to emit one particle for every decal but that applied lifetime, speed, and all the other stuff I don't want with bullet decals and just resulted in weird behavior.

So, is there any way to make the particle system just take of size and color for me so I can just set the position and rotation?