three.js粗线飞线动画

three.js粗线飞线动画

/**
 * @author WestLangley / http://github.com/WestLangley
 *
 * parameters = {
 *  color: ,
 *  linewidth: ,
 *  dashed: ,
 *  dashScale: ,
 *  dashSize: ,
 *  gapSize: ,
 *  resolution: , // to be set by renderer
 * }
 */

import {
	ShaderLib,
	ShaderMaterial,
	UniformsLib,
	UniformsUtils,
	Vector2
} from "../../../build/three.module.js";

UniformsLib.line = {

	linewidth: { value: 1 },
	resolution: { value: new Vector2(1, 1) },
	dashScale: { value: 1 },
	dashSize: { value: 1 },
	gapSize: { value: 1 }, // todo FIX - maybe change to totalSize
};

ShaderLib['line'] = {

	uniforms: UniformsUtils.merge([
		UniformsLib.common,
		UniformsLib.fog,
		UniformsLib.line,
		// toumingdu
	]),

	vertexShader:
		`
		#include 
		#include 
		#include 
		#include 
		#include 

		uniform float linewidth;
		uniform vec2 resolution;

		attribute vec3 instanceStart;
		attribute vec3 instanceEnd;

		attribute vec3 instanceColorStart;
		attribute vec3 instanceColorEnd;

		varying vec2 vUv;

		#ifdef USE_DASH

			uniform float dashScale;
			attribute float instanceDistanceStart;
			attribute float instanceDistanceEnd;
			varying float vLineDistance;

		#endif

		void trimSegment( const in vec4 start, inout vec4 end ) {

			// trim end segment so it terminates between the camera plane and the near plane

			// conservative estimate of the near plane
			float a = projectionMatrix[ 2 ][ 2 ]; // 3nd entry in 3th column
			float b = projectionMatrix[ 3 ][ 2 ]; // 3nd entry in 4th column
			float nearEstimate = - 0.5 * b / a;

			float alpha = ( nearEstimate - start.z ) / ( end.z - start.z );

			end.xyz = mix( start.xyz, end.xyz, alpha );

		}

		void main() {

			#ifdef USE_COLOR

				vColor.xyz = ( position.y < 0.5 ) ? instanceColorStart : instanceColorEnd;

			#endif

			#ifdef USE_DASH

				vLineDistance = ( position.y < 0.5 ) ? dashScale * instanceDistanceStart : dashScale * instanceDistanceEnd;

			#endif

			float aspect = resolution.x / resolution.y;

			vUv = uv;

			// camera space
			vec4 start = modelViewMatrix * vec4( instanceStart, 1.0 );
			vec4 end = modelViewMatrix * vec4( instanceEnd, 1.0 );

			// special case for perspective projection, and segments that terminate either in, or behind, the camera plane
			// clearly the gpu firmware has a way of addressing this issue when projecting into ndc space
			// but we need to perform ndc-space calculations in the shader, so we must address this issue directly
			// perhaps there is a more elegant solution -- WestLangley

			bool perspective = ( projectionMatrix[ 2 ][ 3 ] == - 1.0 ); // 4th entry in the 3rd column

			if ( perspective ) {

				if ( start.z < 0.0 && end.z >= 0.0 ) {

					trimSegment( start, end );

				} else if ( end.z < 0.0 && start.z >= 0.0 ) {

					trimSegment( end, start );

				}

			}

			// clip space
			vec4 clipStart = projectionMatrix * start;
			vec4 clipEnd = projectionMatrix * end;

			// ndc space
			vec2 ndcStart = clipStart.xy / clipStart.w;
			vec2 ndcEnd = clipEnd.xy / clipEnd.w;

			// direction
			vec2 dir = ndcEnd - ndcStart;

			// account for clip-space aspect ratio
			dir.x *= aspect;
			dir = normalize( dir );

			// perpendicular to dir
			vec2 offset = vec2( dir.y, - dir.x );

			// undo aspect ratio adjustment
			dir.x /= aspect;
			offset.x /= aspect;

			// sign flip
			if ( position.x < 0.0 ) offset *= - 1.0;

			// endcaps
			if ( position.y < 0.0 ) {

				offset += - dir;

			} else if ( position.y > 1.0 ) {

				offset += dir;

			}

			// adjust for linewidth
			offset *= linewidth;

			// adjust for clip-space to screen-space conversion // maybe resolution should be based on viewport ...
			offset /= resolution.y;

			// select end
			vec4 clip = ( position.y < 0.5 ) ? clipStart : clipEnd;

			// back to clip space
			offset *= clip.w;

			clip.xy += offset;

			gl_Position = clip;

			vec4 mvPosition = ( position.y < 0.5 ) ? start : end; // this is an approximation

			#include 
			#include 
			#include 

		}
		`,

	fragmentShader:
		`
	uniform vec3 diffuse;
	uniform float opacity;

	#ifdef USE_DASH

		uniform float dashSize;
		uniform float gapSize;

	#endif

	varying float vLineDistance;

	#include 
	#include 
	#include 
	#include 
	#include 

	varying vec2 vUv;

	void main() {

		#include 

		#ifdef USE_DASH

			if ( vUv.y < - 1.0 || vUv.y > 1.0 ) discard; // discard endcaps

			if ( mod( vLineDistance, dashSize + gapSize ) > dashSize ) discard; // todo - FIX

		#endif

		if ( abs( vUv.y ) > 1.0 ) {

			float a = vUv.x;
			float b = ( vUv.y > 0.0 ) ? vUv.y - 1.0 : vUv.y + 1.0;
			float len2 = a * a + b * b;

			if ( len2 > 1.0 ) discard;

		}

		// vec4 diffuseColor = vec4( diffuse, 0.5 );
		vec4 diffuseColor = vec4( diffuse, opacity );

		#include 
		#include 
		
		// gl_FragColor = vec4( diffuseColor.rgb, diffuseColor.a );
		gl_FragColor = vec4( diffuseColor.rgb, diffuseColor.a );

		#include 
		#include 
		#include 
		#include 

	}
	`
};

var LineMaterial = function (parameters) {
	let uniforms = UniformsUtils.clone(ShaderLib['line'].uniforms);
	ShaderMaterial.call(this, {

		type: 'LineMaterial',

		uniforms: UniformsUtils.clone(ShaderLib['line'].uniforms),

		vertexShader: ShaderLib['line'].vertexShader,
		fragmentShader: ShaderLib['line'].fragmentShader

	});

	this.dashed = false;

	Object.defineProperties(this, {

		color: {

			enumerable: true,

			get: function () {

				return this.uniforms.diffuse.value;

			},

			set: function (value) {

				this.uniforms.diffuse.value = value;

			}

		},

		opacity: {

			enumerable: true,

			get: function () {

				return this.uniforms.opacity.value;

			},

			set: function (value) {

				this.uniforms.opacity.value = value;

			}

		},

		linewidth: {

			enumerable: true,

			get: function () {

				return this.uniforms.linewidth.value;

			},

			set: function (value) {

				this.uniforms.linewidth.value = value;

			}

		},

		dashScale: {

			enumerable: true,

			get: function () {

				return this.uniforms.dashScale.value;

			},

			set: function (value) {

				this.uniforms.dashScale.value = value;

			}

		},

		dashSize: {

			enumerable: true,

			get: function () {

				return this.uniforms.dashSize.value;

			},

			set: function (value) {

				this.uniforms.dashSize.value = value;

			}

		},

		gapSize: {

			enumerable: true,

			get: function () {

				return this.uniforms.gapSize.value;

			},

			set: function (value) {

				this.uniforms.gapSize.value = value;

			}

		},

		resolution: {

			enumerable: true,

			get: function () {

				return this.uniforms.resolution.value;

			},

			set: function (value) {

				this.uniforms.resolution.value.copy(value);

			}

		}

	});

	this.setValues(parameters);

};

LineMaterial.prototype = Object.create(ShaderMaterial.prototype);
LineMaterial.prototype.constructor = LineMaterial;

LineMaterial.prototype.isLineMaterial = true;

LineMaterial.prototype.copy = function (source) {

	ShaderMaterial.prototype.copy.call(this, source);

	this.color.copy(source.color);

	this.linewidth = source.linewidth;

	this.resolution = source.resolution;

	this.opacity = source.opacity;

	// todo

	return this;

};


export { LineMaterial };

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