3D border distance

Used to detect the distance from the player to the border and realize the range luminous display.

The default is to use a noise map, but it can be modified to a specified texture.

How to use:

Add to the object material (if you need to keep it transparent, please add it to next_pass)

Dynamically update player_position in the code

Shader code

shader_type spatial;
render_mode blend_mix, unshaded; // 启用透明混合

// 控制参数
uniform float fade_radius : hint_range(0.5, 10.0) = 2.0;
uniform float max_intensity : hint_range(0.0, 5.0) = 1.0;
uniform vec3 player_position;
uniform sampler2D noise_tex : source_color; // 噪声纹理
uniform float noise_scale : hint_range(0.1, 5.0) = 1.0;
uniform float pulse_speed : hint_range(0.0, 5.0) = 1.0;

varying vec3 world_pos; // 传递世界坐标

void vertex() {
    // 计算顶点世界坐标（关键修正）
    world_pos = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
}

void fragment() {
    // 动态半径（呼吸效果）
    float animated_radius = fade_radius * (0.9 + 0.1 * sin(TIME * pulse_speed));
    
    // 计算玩家距离（世界坐标系）
    float distance_to_player = distance(world_pos, player_position);
    
    // 基础渐变强度
    float intensity = 1.0 - smoothstep(0.0, animated_radius, distance_to_player);
    
    // 添加噪声扰动
    vec2 noise_uv = UV * noise_scale;
    float noise = texture(noise_tex, noise_uv).r;
    intensity *= mix(0.5, 1.5, noise); // 噪声影响强度
    
    // 颜色混合
    vec4 base_color = vec4(0.0, 0.0, 0.0, 0.0); // 完全透明
    vec4 glow_color = vec4(0.5, 0.8, 1.0, 0.8); // 半透明光晕
    
    // 最终效果
    ALBEDO = glow_color.rgb * intensity * max_intensity;
    EMISSION = ALBEDO;
    ALPHA = glow_color.a * intensity; // 根据强度控制透明度
}

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