I have a GPUParticles2D that emits 4 particles with explosiveness. I want to make these particles spread evenly, so it would be something like 45°, 135°, 180° and 225°. If I could make them spread like 30°, 150°, 210° and 330°, it's even better.
How to make my Particles spread evenly?
UpsetChicken Convert particle process mateial to shader and make an intervention in the shader code that snaps the angle to those specific values.
- Edited
UpsetChicken You can do it without shaders by explicitly emitting each particle using GPUParticles2D::emit_particle(). The function lets you specify the velocity vector.
Hey, I managed to make a shader code to do this, but my particles don't move anymore. Can you help me?
shader_type canvas_item;
uniform vec2 direction1 = vec2(4.0, 1.0);
uniform vec2 direction2 = vec2(-4.0, 1.0);
uniform vec2 direction3 = vec2(4.0, -1.0);
uniform vec2 direction4 = vec2(-4.0, -1.0);
uniform float time_scale = 1.0;
uniform float speed_factor = 100.0; // Speed factor for particle movement
void fragment() {
// Use a random value to choose a direction
float random_value = fract(sin(TIME * time_scale) * 43758.5453);
vec2 selected_direction;
if (random_value < 0.25) {
selected_direction = direction1;
} else if (random_value < 0.5) {
selected_direction = direction2;
} else if (random_value < 0.75) {
selected_direction = direction3;
} else {
selected_direction = direction4;
}
// Calculate movement based on time and selected direction
vec2 position_offset = selected_direction * speed_factor * TIME;
// Offset the fragment coordinates to create movement
vec2 uv = FRAGCOORD.xy + position_offset;
// Set the color based on the new fragment coordinates
COLOR = vec4(1.0, 1.0, 1.0, 1.0); // White particles}
UpsetChicken You need to use a particle shader assigned to particle_material property of the particle system node, not a canvas item shader.
Much easier to do it from script with emit_particle() though.