Radar Scanning Effect Shader

This is a radar scanning effect shader.

Shader code
/*
	レーダースキャンシェーダー by あるる(きのもと 結衣)
	Radar Scanning Shader by Yui Kinomoto @arlez80

	MIT License
*/

shader_type spatial;
render_mode unshaded;

const float PI = 3.1415926535;

uniform vec3 shift = vec3( 0.0, 0.0, 0.0 );
uniform vec3 time_shift_scale = vec3( 0.0, 0.0, 0.0 );
uniform vec3 scan_power = vec3( 1.8, 0.0, 0.0 );
uniform vec4 scan_color : hint_color = vec4( 0.26, 1.0, 0.48, 1.0 );
uniform float scan_line_size = 0.25;
uniform float scan_line_delay : hint_range( 0.0, 1.0 ) = 0.65;

varying vec3 local_vertex;

float get_ratio_scan_line( float p, float speed )
{
	float p2 = mix( -p, p, max( 0.0, sign( speed ) ) );
	return mod( p2, scan_line_size ) / scan_line_size - ( 1.0 - scan_line_delay );
}

void vertex( )
{
	local_vertex = VERTEX + shift - time_shift_scale * TIME;
}

void fragment( )
{
	float v = clamp(
		get_ratio_scan_line( local_vertex.x, time_shift_scale.x ) * scan_power.x
	+	get_ratio_scan_line( local_vertex.y, time_shift_scale.y ) * scan_power.y
	+	get_ratio_scan_line( local_vertex.z, time_shift_scale.z ) * scan_power.z
	,	0.0
	,	1.0
	);

	ALBEDO = scan_color.rgb;
	ALPHA = scan_color.a * v;
}
Tags
radar, scan
The shader code and all code snippets in this post are under MIT license and can be used freely. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

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matsakis27
matsakis27
9 months ago

Hi, I was wondering how I could get this to work on a 2D sprite?

Thank you