Hatch

/*
FOR SCREEN POST-PROCESSING (GRAY SCALE AND DITHERING)
*/

shader_type canvas_item;

uniform sampler2D texture_screen : hint_screen_texture;
uniform sampler2D texture_noise;

uniform float colors : hint_range(1.0, 16.0);
uniform float dither : hint_range(0.0, 0.5);

void fragment() {
	
	COLOR = texture(texture_screen, SCREEN_UV);
	float avg = (COLOR.r + COLOR.g + COLOR.b) / 3.0;
	
	COLOR.rgb = vec3(avg);
	float a = floor(mod(UV.x / TEXTURE_PIXEL_SIZE.x, 2.0));
	float b = floor(mod(UV.y / TEXTURE_PIXEL_SIZE.y, 2.0));	
	float c = mod(a + b, 2.0);
	
	vec4 color = COLOR;
	
	COLOR.r = (round(color.r * colors + dither) / colors) * c;
	COLOR.g = (round(color.g * colors + dither) / colors) * c;
	COLOR.b = (round(color.b * colors + dither) / colors) * c;
	c = 1.0 - c;
	COLOR.r += (round(color.r * colors - dither) / colors) * c;
	COLOR.g += (round(color.g * colors - dither) / colors) * c;
	COLOR.b += (round(color.b * colors - dither) / colors) * c;
}

Shader code

/*
FOR 3D MODELS
*/

shader_type spatial;

//render_mode unshaded;

uniform sampler2D texture_hatch_1 : filter_linear;

void vertex() {
	
}

void fragment() {
	
	vec4 h1 = texture(texture_hatch_1, vec2(1.001f, sin(0.5)) * SCREEN_UV * 5.0);
	h1 *= h1 * h1 * h1;
	
	vec3 xnm = NORMAL;
	vec3 col = vec3(xnm.x + xnm.y + xnm.z) / 3.0;
	//col.x = round(col.x);
	//col.y = round(col.y);
	//col.z = round(col.z);
	
	col.rgb *= 2.1;
	col.rgb *= (floor(6.0 * col.rgb) * 4.0) / 9.0;
	
	ALBEDO.rgb = h1.rgb * col;//mix(h1.rgb, col, 0.7);
	
}

void light() {
	DIFFUSE_LIGHT = vec3(0.5f);
	DIFFUSE_LIGHT = vec3(floor(6.f * DIFFUSE_LIGHT) * 4.f) / 9.f;
}

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