Cesium 纹理贴图完整

Cesium纹理贴图根据纹理坐标(2,2)实现2X2的纹理贴图，实现如下效果：首次测试代码如下：constmaterial=Material.fromType(Material.ImageType);material.uniforms.image=image;material.shaderSource=`uniformvec4color_2;uniformvec2repeat_1;uniformsampler2Dimage_0;czm_materialczm_getMaterial(czm_materialInputmaterialInput){czm_materialmaterial=czm_getDefaultMaterial(materialInput);vec2st=materialInput.st;material.diffuse=czm_gammaCorrect(texture2D(image_0,fract(st))).rgb;material.alpha=texture2D(image_0,fract(st)).a;returnmaterial;}`letpositions=newFloat64Array([0.0,0.0,0.0,5000.0,0.0,0.0,5000.0,5000.0,0.0,0.0,5000.0,0.0]);/*纹理坐标*/letuv=[0.0,0.0,2.0,0.0,2.0,2.0,0.0,2.0,];/*发现线*/letnormal=[0.0,0.0,1.0,0.0,0.0,1.0,0.0,0.0,1.0,0.0,0.0,1.0,];letgeometry=newGeometry({attributes:{position:newGeometryAttribute({componentDatatype:ComponentDatatype.DOUBLE,componentsPerAttribute:3,values:positions}),st:newGeometryAttribute({componentDatatype:ComponentDatatype.FLOAT,//数据类型componentsPerAttribute:2,//定义几个为一组values:uv//坐标值}),normal:newGeometryAttribute({componentDatatype:ComponentDatatype.FLOAT,componentsPerAttribute:3,values:normal})},indices:newUint16Array([0,1,2,0,2,3]),primitiveType:PrimitiveType.TRIANGLES,boundingSphere:BoundingSphere.fromVertices(positions)});letrectangleInstance=newGeometryInstance({modelMatrix:Matrix4.multiplyByTranslation(Transforms.eastNorthUpToFixedFrame(this.position),newCartesian3(0.0,0.0,100),newMatrix4()),geometry:geometry,id:'rectangle',});letappr=newMaterialAppearance({material:material});letprimitive=scene.primitives.add(newPrimitive({asynchronous:false,geometryInstances:rectangleInstance,appearance:appr,}));实现效果变成2X1的效果图，而不是2X2的效果图出现这种效果原因：在Cesium源码中Primitive源代码中查看：在如下这段代码中发现，执行了代码纹理压缩，而压缩纹理部分是S部分，而T部分是不压缩的，导致T纹理值为1，而S部分正常functionmodifyForEncodedNormals(primitive,vertexShaderSource){if(!pressVertices){returnvertexShaderSource;}varcontainsNormal=vertexShaderSource.search(/attribute\s+vec3\s+normal;/g)!==-1;varcontainsSt=vertexShaderSource.search(/attribute\s+vec2\s+st;/g)!==-1;if(!containsNormal&&!containsSt){returnvertexShaderSource;}varcontainsTangent=vertexShaderSource.search(/attribute\s+vec3\s+tangent;/g)!==-1;varcontainsBitangent=vertexShaderSource.search(/attribute\s+vec3\s+bitangent;/g)!==-1;varnumComponents=containsSt&&containsNormal?2.0:1.0;numComponents+=containsTangent||containsBitangent?1:0;vartype=numComponents>1?"vec"+numComponents:"float";varattributeName="compressedAttributes";varattributeDecl="attribute"+type+""+attributeName+";";varglobalDecl="";vardecode="";if(containsSt){globalDecl+="vec2st;\n";varstComponent=numComponents>1?attributeName+".x":attributeName;decode+="st=czm_decompressTextureCoordinates("+stComponent+");\n";}if(containsNormal&&containsTangent&&containsBitangent){globalDecl+="vec3normal;\n"+"vec3tangent;\n"+"vec3bitangent;\n";decode+="czm_octDecode("+attributeName+"."+(containsSt?"yz":"xy")+",normal,tangent,bitangent);\n";}else{if(containsNormal){globalDecl+="vec3normal;\n";decode+="normal=czm_octDecode("+attributeName+(numComponents>1?"."+(containsSt?"y":"x"):"")+");\n";}if(containsTangent){globalDecl+="vec3tangent;\n";decode+="tangent=czm_octDecode("+attributeName+"."+(containsSt&&containsNormal?"z":"y")+");\n";}if(containsBitangent){globalDecl+="vec3bitangent;\n";decode+="bitangent=czm_octDecode("+attributeName+"."+(containsSt&&containsNormal?"z":"y")+");\n";}}varmodifiedVS=vertexShaderSource;modifiedVS=modifiedVS.replace(/attribute\s+vec3\s+normal;/g,"");modifiedVS=modifiedVS.replace(/attribute\s+vec2\s+st;/g,"");modifiedVS=modifiedVS.replace(/attribute\s+vec3\s+tangent;/g,"");modifiedVS=modifiedVS.replace(/attribute\s+vec3\s+bitangent;/g,"");modifiedVS=ShaderSource.replaceMain(modifiedVS,"czm_non_compressed_main");varcompressedMain="voidmain()\n"+"{\n"+decode+"czm_non_compressed_main();\n"+"}";return[attributeDecl,globalDecl,modifiedVS,compressedMain].join("\n");}解决问题：将compressVertices设置为false即可letprimitive=scene.