godot引擎学习之shader小课3-图片灰度特效

我根据上节学的，也写了个透明

shader_type canvas_item;

void fragment()

{

vec4 transparent = vec4(0.0);

vec4 img = texture(TEXTURE, UV);

float t = abs(sin(TIME));

vec4 c = mix(img, transparent, t);

COLOR = c;

}