Add existing to tracked

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

@@ -0,0 +1,13 @@
+//This file is automatically rebuilt by the Cesium build process.
+export default "uniform sampler2D image;\n\
+\n\
+czm_material czm_getMaterial(czm_materialInput materialInput)\n\
+{\n\
+    czm_material material = czm_getDefaultMaterial(materialInput);\n\
+    vec4 rampColor = texture(image, vec2(materialInput.slope / (czm_pi / 2.0), 0.5));\n\
+    rampColor = czm_gammaCorrect(rampColor);\n\
+    material.diffuse = rampColor.rgb;\n\
+    material.alpha = rampColor.a;\n\
+    return material;\n\
+}\n\
+";