Radar Blip Ring
Creates an expanding ring for a radar blip (Part of a pack of 3 shaders)
- Radar Scanner
- Radar Blip
- Radar Blip Ring (current)
Implementation:
I used a ColorRect in the size that I wanted the scanner to be
Uniforms:
Circle Width: How wide the ring should be
Wait TIme: How long to wait between each expansion
Speed: How quickly the ring expands
Alpha Boost: Multiplicative factor for the ring’s alpha value
Shader code
shader_type canvas_item;
// --- Uniforms --- //
uniform float circle_width: hint_range(0.0, 1.0, 0.05) = 0.15;
uniform float wait_time: hint_range(0.0, 5.0, 0.1) = 0.5;
uniform float speed: hint_range(0.0, 10.0, 0.1) = 1.0;
uniform float alpha_boost: hint_range(1.0, 5.0, 0.1) = 2.0;
// --- Functions --- //
void fragment() {
float dist = distance(UV, vec2(0.5));
float mod_dist = dist - mod(TIME * speed, 0.75 + wait_time) + 0.5;
COLOR.a *= 1.0 - step(0.5, mod_dist);
COLOR.a += step(0.5 - circle_width / 2.0, mod_dist) - 1.0;
COLOR.a -= 2.0 * dist;
COLOR.a *= alpha_boost;
}
Adjusted the transparency of the shader. Why was it opaque.
Here is the code:
shader_type canvas_item;
// — Uniforms — //
uniform float circle_width: hint_range(0.0, 1.0, 0.05) = 0.15;
uniform float wait_time: hint_range(0.0, 5.0, 0.1) = 0.5;
uniform float speed: hint_range(0.0, 10.0, 0.1) = 1.0;
uniform float alpha_boost: hint_range(1.0, 5.0, 0.1) = 2.0;
// — Functions — //
void fragment() {
float dist = distance(UV, vec2(0.5));
float mod_dist = dist – mod(TIME * speed, 0.75 + wait_time) + 0.5;
// Background transparency
COLOR.a = 0.0; // The background is completely transparent
// Ring effect
float ring_alpha = 1.0 – step(0.5, mod_dist); // Transparency inside the ring
ring_alpha += step(0.5 – circle_width / 2.0, mod_dist) – 1.0; // Transparency of the edges of the ring
ring_alpha -= 2.0 * dist; // Attenuation of transparency with distance
ring_alpha *= alpha_boost; // Increased transparency
// Applying the transparency of the effect
if (ring_alpha > 0.0) {
COLOR.a = ring_alpha; // Leaving only the effect
}
}
Simple, straightforward, easy to apply, many thanks!