Pixel Perfect outline shader
Uploading this because couldn’t find one on this site.
Same outline size from any distance, perfect for interactable objects.
Mode for Godot 4.
To use in Godot 3 replace “source_color” with “hint_color”
Shader code
shader_type spatial;
render_mode cull_front, unshaded;
uniform vec4 outline_color : source_color;
uniform float outline_width = 1.0;
void vertex() {
vec4 clip_position = PROJECTION_MATRIX * (MODELVIEW_MATRIX * vec4(VERTEX, 1.0));
vec3 clip_normal = mat3(PROJECTION_MATRIX) * (mat3(MODELVIEW_MATRIX) * NORMAL);
vec2 offset = normalize(clip_normal.xy) / VIEWPORT_SIZE * clip_position.w * outline_width * 2.0;
clip_position.xy += offset;
POSITION = clip_position;
}
void fragment() {
ALBEDO = outline_color.rgb;
if (outline_color.a < 1.0) {
ALPHA = outline_color.a;
}
}