Godot shader that samples texture from world pos oriented with surface normal

face_oriented.gdshader

shader_type spatial;
// if you have a mesh with big flat surfaces this might work better than a triplanar shader
// applied to a curved surfact this will look distorted

uniform sampler2D main_texture:source_color, repeat_enable;

uniform float scale = 1.0;

varying vec3 world_pos;
varying vec3 world_tangent;
varying vec3 world_binormal;

void vertex() {
	world_pos = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
	world_tangent = MODEL_NORMAL_MATRIX * TANGENT;
	world_binormal = MODEL_NORMAL_MATRIX * BINORMAL;
}

void fragment() {
	vec2 face_uv = vec2(dot(world_pos, world_tangent), dot(world_binormal, world_pos)) / scale;
	ALBEDO = texture(main_texture, face_uv).rgb;
}