Variable particleFragShader
particleFragShader: "\nvarying vec2 vUV;\nvarying vec4 vColor;\n\n#ifdef TILE_BLEND\nvarying vec2 vUV2;\nvarying float vTileBlend;\n#endif\n\n#ifdef USE_MAP\nuniform sampler2D map;\n#endif\n\n#ifdef SOFT_PARTICLES\nuniform sampler2D depthTexture;\nuniform vec2 softParams;\nuniform vec4 projParams;\nvarying vec4 projPosition;\nvarying float linearDepth;\n#endif\n\n#ifdef USE_ALPHATEST\nuniform float alphaTest;\n#endif\n\nvoid main() {\n vec4 baseColor = vColor;\n\n#ifdef USE_MAP\n vec4 texColor = texture2D(map, vUV);\n #ifdef TILE_BLEND\n vec4 texColor2 = texture2D(map, vUV2);\n texColor = mix(texColor, texColor2, vTileBlend);\n #endif\n baseColor *= texColor;\n#endif\n\n#ifdef USE_COLOR_AS_ALPHA\n baseColor.a *= (baseColor.r + baseColor.g + baseColor.b) / 3.0;\n#endif\n\n#ifdef USE_ALPHATEST\n if (baseColor.a < alphaTest) discard;\n#else\n if (baseColor.a < 0.01) discard;\n#endif\n\n gl_FragColor = baseColor;\n\n#ifdef SOFT_PARTICLES\n vec2 p2 = projPosition.xy / projPosition.w;\n p2 = 0.5 * p2 + 0.5;\n float readDepth = texture2D(depthTexture, p2.xy).r;\n float zNear = projParams.x;\n float zFar = projParams.y;\n float viewDepth = (zFar * zNear) / (zFar - readDepth * (zFar - zNear));\n float fade = clamp(softParams.y * ((viewDepth - softParams.x) - linearDepth), 0.0, 1.0);\n gl_FragColor *= fade;\n#endif\n}\n"