Use different naming for fullbright, and always reset it back after setting it.

src/main/java/appeng/client/render/cablebus/CubeBuilder.java

@@ -52,7 +52,7 @@ public class CubeBuilder {
 
     private boolean useStandardUV = false;
 
-    private boolean renderFullBright;
+    private boolean emissiveMaterial;
 
     public CubeBuilder(List<BakedQuad> output) {
         this.output = output;
@@ -379,7 +379,7 @@ public class CubeBuilder {
                     if (e.getIndex() == 0) {
                         builder.put(i, u, v);
                         break;
-                    } else if (e.getIndex() == 2 && renderFullBright) {
+                    } else if (e.getIndex() == 2 && emissiveMaterial) {
                         // Force Brightness to 15, this is for full bright mode
                         // this vertex element will only be present in that case
                         final float lightMapU = (float) (15 * 0x20) / 0xFFFF;
@@ -434,8 +434,8 @@ public class CubeBuilder {
         this.setColorRGB((int) (r * 255) << 16 | (int) (g * 255) << 8 | (int) (b * 255));
     }
 
-    public void setRenderFullBright(boolean renderFullBright) {
-        this.renderFullBright = renderFullBright;
+    public void setEmissiveMaterial(boolean renderFullBright) {
+        this.emissiveMaterial = renderFullBright;
     }
 
     public void setCustomUv(Direction facing, float u1, float v1, float u2, float v2) {