添加关照、全局等高线、修改图层问题

static/sdk/three/jsm/shaders/SSRShader.js

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+import {
+	Matrix4,
+	Vector2
+} from 'three';
+/**
+ * References:
+ * https://lettier.github.io/3d-game-shaders-for-beginners/screen-space-reflection.html
+ */
+
+const SSRShader = {
+
+	name: 'SSRShader',
+
+	defines: {
+		MAX_STEP: 0,
+		PERSPECTIVE_CAMERA: true,
+		DISTANCE_ATTENUATION: true,
+		FRESNEL: true,
+		INFINITE_THICK: false,
+		SELECTIVE: false,
+	},
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'tNormal': { value: null },
+		'tMetalness': { value: null },
+		'tDepth': { value: null },
+		'cameraNear': { value: null },
+		'cameraFar': { value: null },
+		'resolution': { value: new Vector2() },
+		'cameraProjectionMatrix': { value: new Matrix4() },
+		'cameraInverseProjectionMatrix': { value: new Matrix4() },
+		'opacity': { value: .5 },
+		'maxDistance': { value: 180 },
+		'cameraRange': { value: 0 },
+		'thickness': { value: .018 }
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}
+
+	`,
+
+	fragmentShader: /* glsl */`
+		// precision highp float;
+		precision highp sampler2D;
+		varying vec2 vUv;
+		uniform sampler2D tDepth;
+		uniform sampler2D tNormal;
+		uniform sampler2D tMetalness;
+		uniform sampler2D tDiffuse;
+		uniform float cameraRange;
+		uniform vec2 resolution;
+		uniform float opacity;
+		uniform float cameraNear;
+		uniform float cameraFar;
+		uniform float maxDistance;
+		uniform float thickness;
+		uniform mat4 cameraProjectionMatrix;
+		uniform mat4 cameraInverseProjectionMatrix;
+		#include <packing>
+		float pointToLineDistance(vec3 x0, vec3 x1, vec3 x2) {
+			//x0: point, x1: linePointA, x2: linePointB
+			//https://mathworld.wolfram.com/Point-LineDistance3-Dimensional.html
+			return length(cross(x0-x1,x0-x2))/length(x2-x1);
+		}
+		float pointPlaneDistance(vec3 point,vec3 planePoint,vec3 planeNormal){
+			// https://mathworld.wolfram.com/Point-PlaneDistance.html
+			//// https://en.wikipedia.org/wiki/Plane_(geometry)
+			//// http://paulbourke.net/geometry/pointlineplane/
+			float a=planeNormal.x,b=planeNormal.y,c=planeNormal.z;
+			float x0=point.x,y0=point.y,z0=point.z;
+			float x=planePoint.x,y=planePoint.y,z=planePoint.z;
+			float d=-(a*x+b*y+c*z);
+			float distance=(a*x0+b*y0+c*z0+d)/sqrt(a*a+b*b+c*c);
+			return distance;
+		}
+		float getDepth( const in vec2 uv ) {
+			return texture2D( tDepth, uv ).x;
+		}
+		float getViewZ( const in float depth ) {
+			#ifdef PERSPECTIVE_CAMERA
+				return perspectiveDepthToViewZ( depth, cameraNear, cameraFar );
+			#else
+				return orthographicDepthToViewZ( depth, cameraNear, cameraFar );
+			#endif
+		}
+		vec3 getViewPosition( const in vec2 uv, const in float depth/*clip space*/, const in float clipW ) {
+			vec4 clipPosition = vec4( ( vec3( uv, depth ) - 0.5 ) * 2.0, 1.0 );//ndc
+			clipPosition *= clipW; //clip
+			return ( cameraInverseProjectionMatrix * clipPosition ).xyz;//view
+		}
+		vec3 getViewNormal( const in vec2 uv ) {
+			return unpackRGBToNormal( texture2D( tNormal, uv ).xyz );
+		}
+		vec2 viewPositionToXY(vec3 viewPosition){
+			vec2 xy;
+			vec4 clip=cameraProjectionMatrix*vec4(viewPosition,1);
+			xy=clip.xy;//clip
+			float clipW=clip.w;
+			xy/=clipW;//NDC
+			xy=(xy+1.)/2.;//uv
+			xy*=resolution;//screen
+			return xy;
+		}
+		void main(){
+			#ifdef SELECTIVE
+				float metalness=texture2D(tMetalness,vUv).r;
+				if(metalness==0.) return;
+			#endif
+
+			float depth = getDepth( vUv );
+			float viewZ = getViewZ( depth );
+			if(-viewZ>=cameraFar) return;
+
+			float clipW = cameraProjectionMatrix[2][3] * viewZ+cameraProjectionMatrix[3][3];
+			vec3 viewPosition=getViewPosition( vUv, depth, clipW );
+
+			vec2 d0=gl_FragCoord.xy;
+			vec2 d1;
+
+			vec3 viewNormal=getViewNormal( vUv );
+
+			#ifdef PERSPECTIVE_CAMERA
+				vec3 viewIncidentDir=normalize(viewPosition);
+				vec3 viewReflectDir=reflect(viewIncidentDir,viewNormal);
+			#else
+				vec3 viewIncidentDir=vec3(0,0,-1);
+				vec3 viewReflectDir=reflect(viewIncidentDir,viewNormal);
+			#endif
+
+			float maxReflectRayLen=maxDistance/dot(-viewIncidentDir,viewNormal);
+			// dot(a,b)==length(a)*length(b)*cos(theta) // https://www.mathsisfun.com/algebra/vectors-dot-product.html
+			// if(a.isNormalized&&b.isNormalized) dot(a,b)==cos(theta)
+			// maxDistance/maxReflectRayLen=cos(theta)
+			// maxDistance/maxReflectRayLen==dot(a,b)
+			// maxReflectRayLen==maxDistance/dot(a,b)
+
+			vec3 d1viewPosition=viewPosition+viewReflectDir*maxReflectRayLen;
+			#ifdef PERSPECTIVE_CAMERA
+				if(d1viewPosition.z>-cameraNear){
+					//https://tutorial.math.lamar.edu/Classes/CalcIII/EqnsOfLines.aspx
+					float t=(-cameraNear-viewPosition.z)/viewReflectDir.z;
+					d1viewPosition=viewPosition+viewReflectDir*t;
+				}
+			#endif
+			d1=viewPositionToXY(d1viewPosition);
+
+			float totalLen=length(d1-d0);
+			float xLen=d1.x-d0.x;
+			float yLen=d1.y-d0.y;
+			float totalStep=max(abs(xLen),abs(yLen));
+			float xSpan=xLen/totalStep;
+			float ySpan=yLen/totalStep;
+			for(float i=0.;i<float(MAX_STEP);i++){
+				if(i>=totalStep) break;
+				vec2 xy=vec2(d0.x+i*xSpan,d0.y+i*ySpan);
+				if(xy.x<0.||xy.x>resolution.x||xy.y<0.||xy.y>resolution.y) break;
+				float s=length(xy-d0)/totalLen;
+				vec2 uv=xy/resolution;
+
+				float d = getDepth(uv);
+				float vZ = getViewZ( d );
+				if(-vZ>=cameraFar) continue;
+				float cW = cameraProjectionMatrix[2][3] * vZ+cameraProjectionMatrix[3][3];
+				vec3 vP=getViewPosition( uv, d, cW );
+
+				#ifdef PERSPECTIVE_CAMERA
+					// https://comp.nus.edu.sg/~lowkl/publications/lowk_persp_interp_techrep.pdf
+					float recipVPZ=1./viewPosition.z;
+					float viewReflectRayZ=1./(recipVPZ+s*(1./d1viewPosition.z-recipVPZ));
+				#else
+					float viewReflectRayZ=viewPosition.z+s*(d1viewPosition.z-viewPosition.z);
+				#endif
+
+				// if(viewReflectRayZ>vZ) continue; // will cause "npm run make-screenshot webgl_postprocessing_ssr" high probability hang.
+				// https://github.com/mrdoob/three.js/pull/21539#issuecomment-821061164
+				if(viewReflectRayZ<=vZ){
+
+					bool hit;
+					#ifdef INFINITE_THICK
+						hit=true;
+					#else
+						float away=pointToLineDistance(vP,viewPosition,d1viewPosition);
+
+						float minThickness;
+						vec2 xyNeighbor=xy;
+						xyNeighbor.x+=1.;
+						vec2 uvNeighbor=xyNeighbor/resolution;
+						vec3 vPNeighbor=getViewPosition(uvNeighbor,d,cW);
+						minThickness=vPNeighbor.x-vP.x;
+						minThickness*=3.;
+						float tk=max(minThickness,thickness);
+
+						hit=away<=tk;
+					#endif
+
+					if(hit){
+						vec3 vN=getViewNormal( uv );
+						if(dot(viewReflectDir,vN)>=0.) continue;
+						float distance=pointPlaneDistance(vP,viewPosition,viewNormal);
+						if(distance>maxDistance) break;
+						float op=opacity;
+						#ifdef DISTANCE_ATTENUATION
+							float ratio=1.-(distance/maxDistance);
+							float attenuation=ratio*ratio;
+							op=opacity*attenuation;
+						#endif
+						#ifdef FRESNEL
+							float fresnelCoe=(dot(viewIncidentDir,viewReflectDir)+1.)/2.;
+							op*=fresnelCoe;
+						#endif
+						vec4 reflectColor=texture2D(tDiffuse,uv);
+						gl_FragColor.xyz=reflectColor.xyz;
+						gl_FragColor.a=op;
+						break;
+					}
+				}
+			}
+		}
+	`
+
+};
+
+const SSRDepthShader = {
+
+	name: 'SSRDepthShader',
+
+	defines: {
+		'PERSPECTIVE_CAMERA': 1
+	},
+
+	uniforms: {
+
+		'tDepth': { value: null },
+		'cameraNear': { value: null },
+		'cameraFar': { value: null },
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}
+
+	`,
+
+	fragmentShader: /* glsl */`
+
+		uniform sampler2D tDepth;
+
+		uniform float cameraNear;
+		uniform float cameraFar;
+
+		varying vec2 vUv;
+
+		#include <packing>
+
+		float getLinearDepth( const in vec2 uv ) {
+
+			#if PERSPECTIVE_CAMERA == 1
+
+				float fragCoordZ = texture2D( tDepth, uv ).x;
+				float viewZ = perspectiveDepthToViewZ( fragCoordZ, cameraNear, cameraFar );
+				return viewZToOrthographicDepth( viewZ, cameraNear, cameraFar );
+
+			#else
+
+				return texture2D( tDepth, uv ).x;
+
+			#endif
+
+		}
+
+		void main() {
+
+			float depth = getLinearDepth( vUv );
+			float d = 1.0 - depth;
+			// d=(d-.999)*1000.;
+			gl_FragColor = vec4( vec3( d ), 1.0 );
+
+		}
+
+	`
+
+};
+
+const SSRBlurShader = {
+
+	name: 'SSRBlurShader',
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'resolution': { value: new Vector2() },
+		'opacity': { value: .5 },
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}
+
+	`,
+
+	fragmentShader: /* glsl */`
+
+		uniform sampler2D tDiffuse;
+		uniform vec2 resolution;
+		varying vec2 vUv;
+		void main() {
+			//reverse engineering from PhotoShop blur filter, then change coefficient
+
+			vec2 texelSize = ( 1.0 / resolution );
+
+			vec4 c=texture2D(tDiffuse,vUv);
+
+			vec2 offset;
+
+			offset=(vec2(-1,0))*texelSize;
+			vec4 cl=texture2D(tDiffuse,vUv+offset);
+
+			offset=(vec2(1,0))*texelSize;
+			vec4 cr=texture2D(tDiffuse,vUv+offset);
+
+			offset=(vec2(0,-1))*texelSize;
+			vec4 cb=texture2D(tDiffuse,vUv+offset);
+
+			offset=(vec2(0,1))*texelSize;
+			vec4 ct=texture2D(tDiffuse,vUv+offset);
+
+			// float coeCenter=.5;
+			// float coeSide=.125;
+			float coeCenter=.2;
+			float coeSide=.2;
+			float a=c.a*coeCenter+cl.a*coeSide+cr.a*coeSide+cb.a*coeSide+ct.a*coeSide;
+			vec3 rgb=(c.rgb*c.a*coeCenter+cl.rgb*cl.a*coeSide+cr.rgb*cr.a*coeSide+cb.rgb*cb.a*coeSide+ct.rgb*ct.a*coeSide)/a;
+			gl_FragColor=vec4(rgb,a);
+
+		}
+	`
+
+
+};
+
+export { SSRShader, SSRDepthShader, SSRBlurShader };