Noir XR/VR Shader

a black & white shader

This shader is supposed to be used mainly in XR/VR, follow the instructions below to get it working in Godot 4 XR/VR

1) add a MeshInstance3D node as a child of the XRCamera3D node

2) select the newly created MeshInstance3D node and under Mesh select type of QuadMesh, change it`s size on x and y to 2m

3) under GeometryInstance3D, click on Material override and create a new ShaderMaterial, now drag and drop the shader into the dropdown

Shader code

shader_type spatial;
render_mode unshaded, depth_test_disabled, cull_disabled;


uniform sampler2D screen_texture : hint_screen_texture;

void vertex(){
	// needs to be 1.0
	VERTEX *= 1.0;
	// needs to be 1.0
	POSITION = vec4(VERTEX, 1.0);
}

void fragment() {
	vec2 texCoords = SCREEN_UV;
	vec3 color = texture(screen_texture, SCREEN_UV).rgb;
	float lum = pow(dot(color, vec3(1.0, 0, 0)), 1.2);
	float brightness = (color.r * color.g * color.b)/0.1;
	vec3 grayScale = vec3(brightness, brightness, brightness);
	color = grayScale;
	ALBEDO = color.rgb * lum;
}

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