Shader特效：流光效果

使用一个渐变图来引导流光的走向

shader_type canvas_item; uniform sampler2D light_vector; uniform float width = 0.08; void fragment(){ vec4 color = texture(TEXTURE,UV); if(color.a != 0.0){ float v = texture(light_vector,UV).r; float diff = v - cos(TIME*0.5); if(abs(diff) < width){ color = vec4(0.3,0.3,0.0,0.3)*(1.0 - abs(diff)/width) + color; } } COLOR = color; }