E250429F
42 lines
2.0 KiB
Plaintext
42 lines
2.0 KiB
Plaintext
shader_type spatial;
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render_mode blend_mix, cull_back, diffuse_burley, specular_schlick_ggx;
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// --- Parameters -------------------------------------------------------
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// Solid tint colors, one per vertex-color channel (R, G, B).
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uniform vec3 color_red : source_color = vec3(1.0, 0.0, 0.0);
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uniform vec3 color_green : source_color = vec3(0.0, 1.0, 0.0);
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uniform vec3 color_blue : source_color = vec3(0.0, 0.0, 1.0);
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// The brush texture. Its R/G/B channels each hold a different brush-stroke
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// variation, used purely as an alpha/shape mask (not as color).
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uniform sampler2D pattern_texture : hint_default_black, repeat_enable, filter_linear_mipmap;
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// How many times the brush pattern repeats over the mesh UVs.
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uniform vec2 pattern_tiling = vec2(1.0, 1.0);
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// --- Hard region selection ---------------------------------------------
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// Vertex color picks the region on/off (assumes verts are painted with
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// clean, mostly-pure R/G/B — not blended mixes). Threshold decides how
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// strong a channel needs to be to count as "painted", smoothness gives
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// a tiny anti-aliased edge instead of a jagged one.
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uniform float region_threshold : hint_range(0.0, 1.0) = 0.5;
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uniform float region_smoothness : hint_range(0.0, 0.5) = 0.05;
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void fragment() {
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vec4 tex = texture(pattern_texture, UV * pattern_tiling);
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// Hard (but lightly smoothed) on/off mask per channel from vertex color.
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float mask_r = smoothstep(region_threshold - region_smoothness, region_threshold + region_smoothness, COLOR.r);
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float mask_g = smoothstep(region_threshold - region_smoothness, region_threshold + region_smoothness, COLOR.g);
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float mask_b = smoothstep(region_threshold - region_smoothness, region_threshold + region_smoothness, COLOR.b);
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// Inside each region, the matching texture channel is only the brush
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// stroke's alpha/shape — the actual color comes from the tint uniform.
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vec3 result =
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mask_r * color_red * tex.r
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+ mask_g * color_green * tex.g
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+ mask_b * color_blue * tex.b;
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ALBEDO = result;
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}
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