only include vPaletteV for color shaders

src/mol-gl/shader/chunks/color-frag-params.glsl.ts

@@ -14,6 +14,11 @@ uniform float uBumpiness;
         varying vec4 vColor;
     #endif
 
+    #ifdef dUsePalette
+        uniform sampler2D tPalette;
+        varying float vPaletteV;
+    #endif
+
     #ifdef dOverpaint
         varying vec4 vOverpaint;
     #endif
@@ -33,9 +38,4 @@ uniform float uBumpiness;
     varying float vGroup;
     varying float vTransparency;
 #endif
-
-#ifdef dUsePalette
-    uniform sampler2D tPalette;
-    varying float vPaletteV;
-#endif
 `;

src/mol-gl/shader/chunks/color-vert-params.glsl.ts

@@ -21,6 +21,10 @@ uniform float uBumpiness;
         uniform sampler2D tColorGrid;
     #endif
 
+    #ifdef dUsePalette
+        varying float vPaletteV;
+    #endif
+
     #ifdef dOverpaint
         #if defined(dOverpaintType_groupInstance) || defined(dOverpaintType_vertexInstance)
             varying vec4 vOverpaint;
@@ -70,8 +74,4 @@ uniform float uBumpiness;
         uniform sampler2D tTransparencyGrid;
     #endif
 #endif
-
-#ifdef dUsePalette
-    varying float vPaletteV;
-#endif
 `;