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web-app/node_modules/three/examples/jsm/materials/LDrawConditionalLineMaterial.js

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+import {
+	Color,
+	ShaderMaterial,
+	UniformsLib,
+	UniformsUtils,
+} from 'three';
+
+class LDrawConditionalLineMaterial extends ShaderMaterial {
+
+	static get type() {
+
+		return 'LDrawConditionalLineMaterial';
+
+	}
+
+	constructor( parameters ) {
+
+		super( {
+
+			uniforms: UniformsUtils.merge( [
+				UniformsLib.fog,
+				{
+					diffuse: {
+						value: new Color()
+					},
+					opacity: {
+						value: 1.0
+					}
+				}
+			] ),
+
+			vertexShader: /* glsl */`
+				attribute vec3 control0;
+				attribute vec3 control1;
+				attribute vec3 direction;
+				varying float discardFlag;
+
+				#include <common>
+				#include <color_pars_vertex>
+				#include <fog_pars_vertex>
+				#include <logdepthbuf_pars_vertex>
+				#include <clipping_planes_pars_vertex>
+				void main() {
+					#include <color_vertex>
+
+					vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
+					gl_Position = projectionMatrix * mvPosition;
+
+					// Transform the line segment ends and control points into camera clip space
+					vec4 c0 = projectionMatrix * modelViewMatrix * vec4( control0, 1.0 );
+					vec4 c1 = projectionMatrix * modelViewMatrix * vec4( control1, 1.0 );
+					vec4 p0 = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+					vec4 p1 = projectionMatrix * modelViewMatrix * vec4( position + direction, 1.0 );
+
+					c0.xy /= c0.w;
+					c1.xy /= c1.w;
+					p0.xy /= p0.w;
+					p1.xy /= p1.w;
+
+					// Get the direction of the segment and an orthogonal vector
+					vec2 dir = p1.xy - p0.xy;
+					vec2 norm = vec2( -dir.y, dir.x );
+
+					// Get control point directions from the line
+					vec2 c0dir = c0.xy - p1.xy;
+					vec2 c1dir = c1.xy - p1.xy;
+
+					// If the vectors to the controls points are pointed in different directions away
+					// from the line segment then the line should not be drawn.
+					float d0 = dot( normalize( norm ), normalize( c0dir ) );
+					float d1 = dot( normalize( norm ), normalize( c1dir ) );
+					discardFlag = float( sign( d0 ) != sign( d1 ) );
+
+					#include <logdepthbuf_vertex>
+					#include <clipping_planes_vertex>
+					#include <fog_vertex>
+				}
+			`,
+
+			fragmentShader: /* glsl */`
+			uniform vec3 diffuse;
+			uniform float opacity;
+			varying float discardFlag;
+
+			#include <common>
+			#include <color_pars_fragment>
+			#include <fog_pars_fragment>
+			#include <logdepthbuf_pars_fragment>
+			#include <clipping_planes_pars_fragment>
+			void main() {
+
+				if ( discardFlag > 0.5 ) discard;
+
+				#include <clipping_planes_fragment>
+				vec3 outgoingLight = vec3( 0.0 );
+				vec4 diffuseColor = vec4( diffuse, opacity );
+				#include <logdepthbuf_fragment>
+				#include <color_fragment>
+				outgoingLight = diffuseColor.rgb; // simple shader
+				gl_FragColor = vec4( outgoingLight, diffuseColor.a );
+				#include <tonemapping_fragment>
+				#include <colorspace_fragment>
+				#include <fog_fragment>
+				#include <premultiplied_alpha_fragment>
+			}
+			`,
+
+		} );
+
+		Object.defineProperties( this, {
+
+			opacity: {
+				get: function () {
+
+					return this.uniforms.opacity.value;
+
+				},
+
+				set: function ( value ) {
+
+					this.uniforms.opacity.value = value;
+
+				}
+			},
+
+			color: {
+				get: function () {
+
+					return this.uniforms.diffuse.value;
+
+				}
+			}
+
+		} );
+
+		this.setValues( parameters );
+		this.isLDrawConditionalLineMaterial = true;
+
+	}
+
+}
+
+export { LDrawConditionalLineMaterial };