threepipe/src/plugins/material/shaders/FragmentClippingExtensionPlugin.pars.glsl

#include <simpleCameraHelpers>
uniform vec4 fragClippingPosition;
uniform vec4 fragClippingParams;
uniform float fragClippingCamAspect;
#if FRAG_CLIPPING_MODE == FragmentClippingMode.Circle
float fragClippingCircle(){
    vec2 pos = viewToScreen(vViewPosition.xyz).xy;
    float radius = fragClippingParams.x;
    vec2 center = fragClippingPosition.xy;
    pos.y /= fragClippingCamAspect;
    center.y /= fragClippingCamAspect;
    return length(pos - center) - radius;
}
#elif FRAG_CLIPPING_MODE == FragmentClippingMode.Ellipse
float fragClippingEllipse(){
    vec2 pos = viewToScreen(vViewPosition.xyz).xy;
    vec2 radius = fragClippingParams.xy;
    vec2 center = fragClippingPosition.xy;
    pos.y /= fragClippingCamAspect;
    center.y /= fragClippingCamAspect;
    return length((pos - center) / radius) - 1.0;
}
#elif FRAG_CLIPPING_MODE == FragmentClippingMode.Rectangle
float fragClippingRectangle(){
    vec2 pos = viewToScreen(vViewPosition.xyz).xy;
    vec2 radius = fragClippingParams.xy;
    vec2 center = fragClippingPosition.xy;
    pos.y /= fragClippingCamAspect;
    center.y /= fragClippingCamAspect;
    vec2 d = abs(pos - center) - radius;
    return min(max(d.x,d.y),0.0) + length(max(d,0.0));
}
#elif FRAG_CLIPPING_MODE == FragmentClippingMode.Plane
float fragClippingPlane(){
    vec3 pos = vViewPosition.xyz;
    vec3 normal = fragClippingParams.xyz;
    float d = dot(pos, normal) - fragClippingParams.w;
    return d;
}
#elif FRAG_CLIPPING_MODE == FragmentClippingMode.Sphere
float fragClippingSphere(){
    vec3 pos = vViewPosition.xyz;
    vec3 center = fragClippingPosition.xyz;
    float radius = fragClippingParams.x;
    pos.y /= fragClippingCamAspect;
    center.y /= fragClippingCamAspect;
    return length(pos - center) - radius;
}
#endif