prepare for vertex array usage

src/main/java/com/enderio/core/client/render/RenderUtil.java

@@ -376,6 +376,24 @@ public static void addVerticesToTessellator(List<Vertex> vertices, Tessellator t
         }
     }
 
+    public static void addVerticesToTessellator(Vertex[] vertices, Tessellator tes) {
+        for (int i = 0; i < vertices.length; i++) {
+            if (vertices[i].brightness != -1) {
+                tes.setBrightness(vertices[i].brightness);
+            }
+            if (vertices[i].color != null) {
+                tes.setColorRGBA_F(vertices[i].r(), vertices[i].g(), vertices[i].b(), vertices[i].a());
+            }
+            if (vertices[i].uv != null) {
+                tes.setTextureUV(vertices[i].u(), vertices[i].v());
+            }
+            if (vertices[i].normal != null) {
+                tes.setNormal(vertices[i].nx(), vertices[i].ny(), vertices[i].nz());
+            }
+            tes.addVertex(vertices[i].x(), vertices[i].y(), vertices[i].z());
+        }
+    }
+
     public static void renderConnectedTextureFace(IBlockAccess blockAccess, Block block, int x, int y, int z,
             ForgeDirection face, IIcon texture, boolean forceAllEdges) {
         renderConnectedTextureFace(blockAccess, block, x, y, z, face, texture, forceAllEdges, true, true);

src/main/java/com/enderio/core/common/vecmath/Vertex.java

@@ -3,6 +3,11 @@
 public class Vertex {
 
     public Vector3d xyz = new Vector3d();
+
+    /*
+     * some parts of EIO are relying on nulls as special values, can't just pre allocate new objects and set them when
+     * required, unless everything relying on nulls is rewritten
+     */
     public Vector2f uv = null;
     public Vector3f normal = null;
     public Vector4f color = null;
@@ -76,6 +81,42 @@ public void setBrightness(int brightness) {
         this.brightness = brightness;
     }
 
+    public void set(Vertex other) {
+        xyz.set(other.xyz);
+
+        if (other.uv != null) {
+            if (uv == null) {
+                uv = new Vector2f(other.uv);
+            } else {
+                uv.set(other.uv);
+            }
+        } else {
+            uv = null;
+        }
+
+        if (other.normal != null) {
+            if (normal == null) {
+                normal = new Vector3f(other.normal);
+            } else {
+                normal.set(other.normal);
+            }
+        } else {
+            normal = null;
+        }
+
+        if (other.color != null) {
+            if (color == null) {
+                color = new Vector4f(other.color);
+            } else {
+                color.set(other.color);
+            }
+        } else {
+            color = null;
+        }
+
+        brightness = other.brightness;
+    }
+
     public Vector4f getColor() {
         return color;
     }