New functions on shape primitives.

1 files changed, 27 insertions, 0 deletions

diff --git a/js/lib/geom/shape-primitive.js b/js/lib/geom/shape-primitive.js
index 380cf334..5a44deb3 100644
--- a/js/lib/geom/shape-primitive.js
+++ b/js/lib/geom/shape-primitive.js
@@ -71,6 +71,33 @@ ShapePrimitive.getMeshBounds = function( verts,  nVerts )
         return bounds;
 };
 
+ShapePrimitive.getBounds = function( prim )
+{
+        var verts = prim.bufferStreams[0];
+        var nVerts = verts.length;
+        var xMin = verts[0],  xMax = verts[0],
+                yMin = verts[1],  yMax = verts[1],
+                zMin = verts[2],  zMax = verts[2];
+
+        for (var index=3;  index<verts.length;  )
+        {
+                if (verts[index] < xMin)  xMin = verts[index];
+                else if (verts[index] > xMax)  xMax = verts[index];
+
+                index++;
+                if (verts[index] < yMin)  yMin = verts[index];
+                else if (verts[index] > yMax)  yMax = verts[index];
+
+                index++;
+                if (verts[index] < zMin)  zMin = verts[index];
+                else if (verts[index] > zMax)  zMax = verts[index];
+
+                index++;
+        }
+
+        return [xMin, yMin, zMin,  xMax, yMax, zMax];
+};
+
 ShapePrimitive.refineMesh = function( verts, norms, uvs, indices, nVertices,  paramRange,  tolerance )
 {
         var oldVrtCount = nVertices;