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cpu_particles: Return uniform density spheres. 

The current implementation normalizes points from a uniform distribution
on a cube. This creates a non-uniform distribution on the sphere.
This commit is contained in:
Simon Puchert 2019-07-06 00:13:03 +02:00
parent d897131ac5
commit 18ba1bc824
2 changed files with 6 additions and 3 deletions
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5
scene/2d/cpu_particles_2d.cpp
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@ -661,8 +661,9 @@ void CPUParticles2D::_particles_process(float p_delta) {
//do none
} break;
case EMISSION_SHAPE_SPHERE: {
Vector3 sphere_shape = Vector3(Math::randf() * 2.0 - 1.0, Math::randf() * 2.0 - 1.0, Math::randf() * 2.0 - 1.0).normalized() * emission_sphere_radius;
p.transform[2] = Vector2(sphere_shape.x, sphere_shape.y);
float s = Math::randf(), t = 2.0 * Math_PI * Math::randf();
float radius = emission_sphere_radius * Math::sqrt(1.0 - s * s);
p.transform[2] = Vector2(Math::cos(t), Math::sin(t)) * radius;
} break;
case EMISSION_SHAPE_RECTANGLE: {
p.transform[2] = Vector2(Math::randf() * 2.0 - 1.0, Math::randf() * 2.0 - 1.0) * emission_rect_extents;

4
scene/3d/cpu_particles.cpp
View File

@ -643,7 +643,9 @@ void CPUParticles::_particles_process(float p_delta) {
//do none
} break;
case EMISSION_SHAPE_SPHERE: {
p.transform.origin = Vector3(Math::randf() * 2.0 - 1.0, Math::randf() * 2.0 - 1.0, Math::randf() * 2.0 - 1.0).normalized() * emission_sphere_radius;
float s = 2.0 * Math::randf() - 1.0, t = 2.0 * Math_PI * Math::randf();
float radius = emission_sphere_radius * Math::sqrt(1.0 - s * s);
p.transform.origin = Vector3(radius * Math::cos(t), radius * Math::sin(t), emission_sphere_radius * s);
} break;
case EMISSION_SHAPE_BOX: {
p.transform.origin = Vector3(Math::randf() * 2.0 - 1.0, Math::randf() * 2.0 - 1.0, Math::randf() * 2.0 - 1.0) * emission_box_extents;