diff options
| -rw-r--r-- | scene/resources/particles_material.cpp | 66 |
1 files changed, 37 insertions, 29 deletions
diff --git a/scene/resources/particles_material.cpp b/scene/resources/particles_material.cpp index 7da9cb96ee..9c8b3875ad 100644 --- a/scene/resources/particles_material.cpp +++ b/scene/resources/particles_material.cpp @@ -338,30 +338,34 @@ void ParticlesMaterial::_update_shader() { } if (particle_flags[PARTICLE_FLAG_DISABLE_Z]) { - 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"; + code += " {\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"; + code += " }\n"; } else { //initiate velocity spread in 3D - 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 += " 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"; - code += " vec3 spread_direction = vec3(direction_xz.x * direction_yz.z, direction_yz.y, direction_xz.z * direction_yz.z);\n"; - code += " vec3 direction_nrm = normalize(direction);\n"; - code += " // rotate spread to direction\n"; - code += " vec3 binormal = cross(vec3(0.0, 1.0, 0.0), direction_nrm);\n"; - code += " if (length(binormal) < 0.0001) {\n"; - code += " // direction is parallel to Y. Choose Z as the binormal.\n"; - code += " binormal = vec3(0.0, 0.0, 1.0);\n"; + code += " {\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 += " 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"; + code += " vec3 spread_direction = vec3(direction_xz.x * direction_yz.z, direction_yz.y, direction_xz.z * direction_yz.z);\n"; + code += " vec3 direction_nrm = length(direction) > 0.0 ? normalize(direction) : vec3(0.0, 0.0, 1.0);\n"; + code += " // rotate spread to direction\n"; + code += " vec3 binormal = cross(vec3(0.0, 1.0, 0.0), direction_nrm);\n"; + code += " if (length(binormal) < 0.0001) {\n"; + code += " // direction is parallel to Y. Choose Z as the binormal.\n"; + code += " binormal = vec3(0.0, 0.0, 1.0);\n"; + code += " }\n"; + code += " binormal = normalize(binormal);\n"; + code += " vec3 normal = cross(binormal, direction_nrm);\n"; + code += " spread_direction = binormal * spread_direction.x + normal * spread_direction.y + direction_nrm * spread_direction.z;\n"; + code += " VELOCITY = spread_direction * initial_linear_velocity * mix(1.0, rand_from_seed(alt_seed), initial_linear_velocity_random);\n"; code += " }\n"; - code += " binormal = normalize(binormal);\n"; - code += " vec3 normal = cross(binormal, direction_nrm);\n"; - code += " spread_direction = binormal * spread_direction.x + normal * spread_direction.y + direction_nrm * spread_direction.z;\n"; - code += " VELOCITY = spread_direction * initial_linear_velocity * mix(1.0, rand_from_seed(alt_seed), initial_linear_velocity_random);\n"; } code += " }\n"; @@ -393,16 +397,20 @@ void ParticlesMaterial::_update_shader() { if (emission_shape == EMISSION_SHAPE_DIRECTED_POINTS) { if (particle_flags[PARTICLE_FLAG_DISABLE_Z]) { - code += " mat2 rotm;"; - code += " rotm[0] = texelFetch(emission_texture_normal, emission_tex_ofs, 0).xy;\n"; - code += " rotm[1] = rotm[0].yx * vec2(1.0, -1.0);\n"; - code += " if (RESTART_VELOCITY) VELOCITY.xy = rotm * VELOCITY.xy;\n"; + code += " {\n"; + code += " mat2 rotm;"; + code += " rotm[0] = texelFetch(emission_texture_normal, emission_tex_ofs, 0).xy;\n"; + code += " rotm[1] = rotm[0].yx * vec2(1.0, -1.0);\n"; + code += " if (RESTART_VELOCITY) VELOCITY.xy = rotm * VELOCITY.xy;\n"; + code += " }\n"; } else { - code += " vec3 normal = texelFetch(emission_texture_normal, emission_tex_ofs, 0).xyz;\n"; - code += " vec3 v0 = abs(normal.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 1.0, 0.0);\n"; - code += " vec3 tangent = normalize(cross(v0, normal));\n"; - code += " vec3 bitangent = normalize(cross(tangent, normal));\n"; - code += " if (RESTART_VELOCITY) VELOCITY = mat3(tangent, bitangent, normal) * VELOCITY;\n"; + code += " {\n"; + code += " vec3 normal = texelFetch(emission_texture_normal, emission_tex_ofs, 0).xyz;\n"; + code += " vec3 v0 = abs(normal.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 1.0, 0.0);\n"; + code += " vec3 tangent = normalize(cross(v0, normal));\n"; + code += " vec3 bitangent = normalize(cross(tangent, normal));\n"; + code += " if (RESTART_VELOCITY) VELOCITY = mat3(tangent, bitangent, normal) * VELOCITY;\n"; + code += " }\n"; } } } break; |