Merge pull request godotengine#12706 from MillionOstrich/particle-ran…

…dom-velocity Fix randomisation of initial particle velocity
Homebrodot · Nov 8, 2017 · 5fb359d · 5fb359d
2 parents b5e8cd3 + eaa8c46
commit 5fb359d
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/scene/3d/particles.cpp b/scene/3d/particles.cpp
@@ -642,15 +642,15 @@ void ParticlesMaterial::_update_shader() {
 
 		code += "		float angle1 = (rand_from_seed(alt_seed)*2.0-1.0)*spread/180.0*3.1416;\n";
 		code += "		vec3 rot = vec3( cos(angle1), sin(angle1),0.0 );\n";
-		code += "		VELOCITY = (rot*initial_linear_velocity+rot*initial_linear_velocity_random*rand_from_seed(alt_seed));\n";
+		code += "		VELOCITY = rot*initial_linear_velocity*mix(1.0, rand_from_seed(alt_seed), initial_linear_velocity_random);\n";
 
 	} else {
 		//initiate velocity spread in 3D
 		code += "		float angle1 = rand_from_seed(alt_seed)*spread*3.1416;\n";
 		code += "		float angle2 = rand_from_seed(alt_seed)*20.0*3.1416; // make it more random like\n";
 		code += "		vec3 rot_xz = vec3( sin(angle1), 0.0, cos(angle1) );\n";
 		code += "		vec3 rot = vec3( cos(angle2)*rot_xz.x,sin(angle2)*rot_xz.x, rot_xz.z);\n";
-		code += "		VELOCITY = (rot*initial_linear_velocity+rot*initial_linear_velocity_random*rand_from_seed(alt_seed));\n";
+		code += "		VELOCITY = rot*initial_linear_velocity*mix(1.0, rand_from_seed(alt_seed), initial_linear_velocity_random);\n";
 	}
 
 	code += "		float base_angle = (initial_angle+tex_angle)*mix(1.0,angle_rand,initial_angle_random);\n";