From 5fc8691176f97e9fdeb609012b0061fbb4de8eb4 Mon Sep 17 00:00:00 2001
From: Simon Puchert <simonpuchert@alice.de>
Date: Sat, 6 Jul 2019 20:05:43 +0200
Subject: [PATCH] particles: Return uniform density spheres.

This matches the previous change for cpu_particles.
---
 scene/resources/particles_material.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scene/resources/particles_material.cpp b/scene/resources/particles_material.cpp
index edca9e5171..b4818755b4 100644
--- a/scene/resources/particles_material.cpp
+++ b/scene/resources/particles_material.cpp
@@ -332,7 +332,10 @@ void ParticlesMaterial::_update_shader() {
 			//do none
 		} break;
 		case EMISSION_SHAPE_SPHERE: {
-			code += "		TRANSFORM[3].xyz = normalize(vec3(rand_from_seed(alt_seed) * 2.0 - 1.0, rand_from_seed(alt_seed) * 2.0 - 1.0, rand_from_seed(alt_seed) * 2.0 - 1.0)) * emission_sphere_radius;\n";
+			code += "		float s = rand_from_seed(alt_seed) * 2.0 - 1.0;\n";
+			code += "		float t = rand_from_seed(alt_seed) * 2.0 * pi;\n";
+			code += "		float radius = emission_sphere_radius * sqrt(1.0 - s * s);\n";
+			code += "		TRANSFORM[3].xyz = vec3(radius * cos(t), radius * sin(t), emission_sphere_radius * s);\n";
 		} break;
 		case EMISSION_SHAPE_BOX: {
 			code += "		TRANSFORM[3].xyz = vec3(rand_from_seed(alt_seed) * 2.0 - 1.0, rand_from_seed(alt_seed) * 2.0 - 1.0, rand_from_seed(alt_seed) * 2.0 - 1.0) * emission_box_extents;\n";