particle color

src/VFX.cs

@@ -61,6 +61,7 @@ public class Particle
     public Vec3 pos, vel;
     public Quat ori;
     public float scl;
+    public Color col;
 
     public Particle()
     {
@@ -69,6 +70,9 @@ public class Particle
         this.vel = Vec3.Zero;
         this.ori = Quat.Identity;
         this.scl = 0.0f;
+        this.col = Color.White;
+    }
+}
 
 public class ParticleSystem
 {