2： outline.gdshader 不支持半透明:
shader_type spatial; render_mode unshaded;/*Normal/Depth outline shader. Apply to nodes as a next pass shader texture.Inspired by Yui Kinomoto @arlez80, lukky_nl (YT), Robin Seibold (YT)Uses Sobel Edge detection on a normal and depth textureWritten by William Li (LoudFlameLava)MIT License */// Might create an outline at the edge of the viewport uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap; uniform sampler2D DEPTH_TEXTURE : hint_depth_texture, filter_linear_mipmap; uniform sampler2D NORMAL_TEXTURE : hint_normal_roughness_texture, filter_linear_mipmap;uniform float normal_threshold = 0.1; uniform float depth_threshold = 0.05; uniform float depth_artifact_correction_coef = 2; uniform vec3 outline_color: source_color;const mat3 sobel_y = mat3(vec3(1.0, 0.0, -1.0),vec3(2.0, 0.0, -2.0),vec3(1.0, 0.0, -1.0) );const mat3 sobel_x = mat3(vec3(1.0, 2.0, 1.0),vec3(0.0, 0.0, 0.0),vec3(-1.0, -2.0, -1.0) );float edge_value_normal(sampler2D normal_tex, vec2 uv, vec2 pixel_size, mat3 sobel) {float output = 0.0;vec3 normal = texture(normal_tex, uv).rgb;vec3 n = texture(NORMAL_TEXTURE, uv + vec2(0.0, -pixel_size.y)).rgb;vec3 s = texture(NORMAL_TEXTURE, uv + vec2(0.0, pixel_size.y)).rgb;vec3 e = texture(NORMAL_TEXTURE, uv + vec2(pixel_size.x, 0.0)).rgb;vec3 w = texture(NORMAL_TEXTURE, uv + vec2(-pixel_size.x, 0.0)).rgb;vec3 nw = texture(NORMAL_TEXTURE, uv + vec2(-pixel_size.x, -pixel_size.y)).rgb;vec3 ne = texture(NORMAL_TEXTURE, uv + vec2(pixel_size.x, -pixel_size.y)).rgb;vec3 sw = texture(NORMAL_TEXTURE, uv + vec2(-pixel_size.x, pixel_size.y)).rgb;vec3 se = texture(NORMAL_TEXTURE, uv + vec2(pixel_size.x, pixel_size.y)).rgb;mat3 error_mat = mat3(vec3(length(normal - nw), length(normal - n), length(normal - ne)),vec3(length(normal - w), 0.0, length(normal - e)),vec3(length(normal - sw), length(normal - s), length(normal - se)));output += dot(sobel[0], error_mat[0]);output += dot(sobel[1], error_mat[1]);output += dot(sobel[2], error_mat[2]);return abs(output); }float get_depth(sampler2D depth_tex, vec2 uv, mat4 inv_projection_matrix) {float depth_raw = texture(depth_tex, uv).x;vec3 ndc = vec3(uv * 2.0 - 1.0, depth_raw);vec4 view = inv_projection_matrix * vec4(ndc, 1.0);view.xyz /= view.w;float depth_linear = -view.z;return depth_linear; }float edge_value_depth(sampler2D depth_tex, vec2 uv, vec2 pixel_size, mat3 sobel, mat4 inv_projection_matrix){float output = 0.0;float depth = get_depth(depth_tex, uv, inv_projection_matrix);float n = get_depth(depth_tex, uv + vec2(0.0, -pixel_size.y), inv_projection_matrix);float s = get_depth(depth_tex, uv + vec2(0.0, pixel_size.y), inv_projection_matrix);float e = get_depth(depth_tex, uv + vec2(pixel_size.x, 0.0), inv_projection_matrix);float w = get_depth(depth_tex, uv + vec2(-pixel_size.x, 0.0), inv_projection_matrix);float ne = get_depth(depth_tex, uv + vec2(pixel_size.x, -pixel_size.y), inv_projection_matrix);float nw = get_depth(depth_tex, uv + vec2(-pixel_size.x, -pixel_size.y), inv_projection_matrix);float se = get_depth(depth_tex, uv + vec2(pixel_size.x, pixel_size.y), inv_projection_matrix);float sw = get_depth(depth_tex, uv + vec2(-pixel_size.x, pixel_size.y), inv_projection_matrix);mat3 error_mat = mat3(vec3((depth - nw)/depth, (depth - n)/depth, (depth - ne)/depth),vec3((depth - w)/depth, 0.0, (depth - e)/depth),vec3((depth - sw)/depth, (depth - s)/depth, (depth - se)/depth));output += dot(sobel[0], error_mat[0]);output += dot(sobel[1], error_mat[1]);output += dot(sobel[2], error_mat[2]);return abs(output); }vec3 get_world_position(vec2 screen_uv, float depth, mat4 _INV_PROJECTION_MATRIX, mat4 _INV_VIEW_MATRIX) {// Convert screen UV to NDCvec4 ndc = vec4(screen_uv * 2.0 - 1.0, depth, 1.0);// Convert NDC to view spacevec4 view_space_pos = _INV_PROJECTION_MATRIX * ndc;view_space_pos /= view_space_pos.w;// Convert view space to world spacevec4 world_space_pos = _INV_VIEW_MATRIX * view_space_pos;return world_space_pos.xyz; }void fragment() {float has_outline = 0.0;vec2 pixel_size = vec2(1.0) / VIEWPORT_SIZE * 0.2;ALBEDO = texture(SCREEN_TEXTURE, SCREEN_UV).xyz;//ALBEDO = vec3(get_depth(DEPTH_TEXTURE, SCREEN_UV, INV_PROJECTION_MATRIX));if (edge_value_normal(NORMAL_TEXTURE, SCREEN_UV, pixel_size, sobel_x) + edge_value_normal(NORMAL_TEXTURE, SCREEN_UV, pixel_size, sobel_y) > normal_threshold){ALBEDO = outline_color;has_outline += 1.0;}vec3 normal = texture(NORMAL_TEXTURE, SCREEN_UV).rgb;float angle = 1.0 - dot(normalize(normal-vec3(0.5)), vec3(0.0,0.0,1.0));if (edge_value_depth(DEPTH_TEXTURE, SCREEN_UV, pixel_size, sobel_x, INV_PROJECTION_MATRIX) + edge_value_depth(DEPTH_TEXTURE, SCREEN_UV, pixel_size, sobel_y, INV_PROJECTION_MATRIX) > depth_threshold + angle * depth_artifact_correction_coef){ALBEDO = outline_color;has_outline += 1.0;}if (has_outline < 0.1){ALPHA = 0.0;}float worldY = get_world_position(SCREEN_UV, texture(DEPTH_TEXTURE, SCREEN_UV).x, INV_PROJECTION_MATRIX, INV_VIEW_MATRIX).y;ALPHA *= clamp((worldY + 70.0) / 70.0, 0.0, 1.0); }
