Add existing to tracked

node_modules/@cesium/engine/Source/Shaders/Materials/ElevationContourMaterial.js

@@ -0,0 +1,28 @@
+//This file is automatically rebuilt by the Cesium build process.
+export default "uniform vec4 color;\n\
+uniform float spacing;\n\
+uniform float width;\n\
+\n\
+czm_material czm_getMaterial(czm_materialInput materialInput)\n\
+{\n\
+    czm_material material = czm_getDefaultMaterial(materialInput);\n\
+\n\
+    float distanceToContour = mod(materialInput.height, spacing);\n\
+\n\
+#if (__VERSION__ == 300 || defined(GL_OES_standard_derivatives))\n\
+    float dxc = abs(dFdx(materialInput.height));\n\
+    float dyc = abs(dFdy(materialInput.height));\n\
+    float dF = max(dxc, dyc) * czm_pixelRatio * width;\n\
+    float alpha = (distanceToContour < dF) ? 1.0 : 0.0;\n\
+#else\n\
+    // If no derivatives available (IE 10?), use pixel ratio\n\
+    float alpha = (distanceToContour < (czm_pixelRatio * width)) ? 1.0 : 0.0;\n\
+#endif\n\
+\n\
+    vec4 outColor = czm_gammaCorrect(vec4(color.rgb, alpha * color.a));\n\
+    material.diffuse = outColor.rgb;\n\
+    material.alpha = outColor.a;\n\
+\n\
+    return material;\n\
+}\n\
+";