diff options
| -rw-r--r-- | scene/resources/particles_material.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/scene/resources/particles_material.cpp b/scene/resources/particles_material.cpp index 412b5c259c..baeb88400e 100644 --- a/scene/resources/particles_material.cpp +++ b/scene/resources/particles_material.cpp @@ -316,14 +316,17 @@ void ParticlesMaterial::_update_shader() { if (flags[FLAG_DISABLE_Z]) { - code += " float angle1_rad = atan(direction.y, direction.x) + rand_from_seed_m1_p1(alt_seed) * spread_rad;\n"; + code += " float angle1_rad = rand_from_seed_m1_p1(alt_seed) * spread_rad;\n"; + code += " angle1_rad += direction.x != 0.0 ? atan(direction.y, direction.x) : sign(direction.y) * (pi / 2.0);\n"; code += " vec3 rot = vec3(cos(angle1_rad), sin(angle1_rad), 0.0);\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_rad = atan(direction.x, direction.z) + rand_from_seed_m1_p1(alt_seed) * spread_rad;\n"; - code += " float angle2_rad = atan(direction.y, abs(direction.z)) + rand_from_seed_m1_p1(alt_seed) * spread_rad * (1.0 - flatness);\n"; + code += " float angle1_rad = rand_from_seed_m1_p1(alt_seed) * spread_rad;\n"; + code += " float angle2_rad = rand_from_seed_m1_p1(alt_seed) * spread_rad * (1.0 - flatness);\n"; + code += " angle1_rad += direction.z != 0.0 ? atan(direction.x, direction.z) : sign(direction.x) * (pi / 2.0);\n"; + code += " angle2_rad += direction.z != 0.0 ? atan(direction.y, abs(direction.z)) : (direction.x != 0.0 ? atan(direction.y, abs(direction.x)) : sign(direction.y) * (pi / 2.0));\n"; code += " vec3 direction_xz = vec3(sin(angle1_rad), 0.0, cos(angle1_rad));\n"; code += " vec3 direction_yz = vec3(0.0, sin(angle2_rad), cos(angle2_rad));\n"; code += " direction_yz.z = direction_yz.z / max(0.0001,sqrt(abs(direction_yz.z))); // better uniform distribution\n"; |