Prototiping GridBox Texture Shader

grid.gdshader

shader_type spatial;
render_mode ensure_correct_normals;
//render_mode world_vertex_coords;


// Based in : https://godotshaders.com/shader/world-coordinates-grid-bw-shader/

uniform vec4 lightColor : hint_color;
uniform vec4 darkColor : hint_color;
uniform vec4 borderColor : hint_color;
const float gridSize = 4f;
const float half = gridSize / 2f;
const float border = gridSize / 1000f;

bool borde(float pos) {
	return mod(pos, 1f) < border || 1f - mod(pos, 1f) < border || mod(pos, 0.5f) < border || 0.5f - mod(pos, 0.5f) < border;
}

void fragment(){
	vec4 world = CAMERA_MATRIX * vec4(VERTEX, 1.0);
	vec3 pos = world.xyz;
	// This is to avoid the zero incoherence
	if (pos.x <= 0f) pos.x = abs(pos.x - half);
	if (pos.y <= 0f) pos.y = abs(pos.y - half);
	if (pos.z <= 0f) pos.z = abs(pos.z - half);
	pos /= gridSize;
	//pos += gridSize * half;
	
	// border color
	vec3 col = vec3(0f);
	if (borde(pos.x)) col -= 1f - borderColor.rgb;
	if (borde(pos.y)) col -= 1f - borderColor.rgb;
	if (borde(pos.z)) col -= 1f - borderColor.rgb;
	
	pos.y += float(fract(float(int(pos.x*half))/half));
	pos.z += float(fract(float(int(pos.y*half))/half));
	
	if (vec3(fract(float(int(pos.z*half))/half)) == vec3(0f)) {
		col += lightColor.rgb;
	} else {
		col += darkColor.rgb;
	}
	
	ROUGHNESS = col.x / half + 0.5;
	ALBEDO = col;
	
	// alpha changes they rendering order
	//ALPHA = 0.5;
}