feat: finally add block RESCALE support! Cobwebs and ascending rails are now rendered correctly

Author: zardoy

renderer/viewer/lib/mesher/models.ts

@@ -336,7 +336,7 @@ function renderElement (world: World, cursor: Vec3, element: BlockElement, doAO:
     let localShift = null as any
 
     if (element.rotation && !needTiles) {
-      // todo do we support rescale?
+      // Rescale support for block model rotations
       localMatrix = buildRotationMatrix(
         element.rotation.axis,
         element.rotation.angle
@@ -349,6 +349,37 @@ function renderElement (world: World, cursor: Vec3, element: BlockElement, doAO:
           element.rotation.origin
         )
       )
+
+      // Apply rescale if specified
+      if (element.rotation.rescale) {
+        const FIT_TO_BLOCK_SCALE_MULTIPLIER = 2 - Math.sqrt(2)
+        const angleRad = element.rotation.angle * Math.PI / 180
+        const scale = Math.abs(Math.sin(angleRad)) * FIT_TO_BLOCK_SCALE_MULTIPLIER
+
+        // Get axis vector components (1 for the rotation axis, 0 for others)
+        const axisX = element.rotation.axis === 'x' ? 1 : 0
+        const axisY = element.rotation.axis === 'y' ? 1 : 0
+        const axisZ = element.rotation.axis === 'z' ? 1 : 0
+
+        // Create scale matrix: scale = (1 - axisComponent) * scaleFactor + 1
+        const scaleMatrix = [
+          [(1 - axisX) * scale + 1, 0, 0],
+          [0, (1 - axisY) * scale + 1, 0],
+          [0, 0, (1 - axisZ) * scale + 1]
+        ]
+
+        // Apply scaling to the transformation matrix
+        localMatrix = matmulmat3(localMatrix, scaleMatrix)
+
+        // Recalculate shift with the new matrix
+        localShift = vecsub3(
+          element.rotation.origin,
+          matmul3(
+            localMatrix,
+            element.rotation.origin
+          )
+        )
+      }
     }
 
     const aos: number[] = []