added some basic bounds

examples/BoundsExample.ipynb

+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import meshvis\n",
+    "import openmesh as om\n",
+    "import numpy as np\n",
+    "\n",
+    "m = om.PolyMesh()\n",
+    "\n",
+    "om.read_mesh(m, 'models/bunny.obj')\n",
+    "\n",
+    "vertices = m.points()\n",
+    "faces = m.face_vertex_indices()\n",
+    "\n",
+    "\n",
+    "mesh = meshvis.Mesh(vertices, faces, \n",
+    "                    normals = meshvis.calculateFaceNormals(vertices, faces))\n",
+    "\n",
+    "ctx = meshvis.Context()\n",
+    "ctx.draw(mesh, shading='flat', clipping_planes=[meshvis.Plane((1.0, 0.0, 0.0) , 0)])\n",
+    "ctx.showBounds()\n",
+    "ctx.display()"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

examples/ClippedDrawing.ipynb

@@ -21,8 +21,19 @@
     "mesh = meshvis.Mesh(vertices, faces, \n",
     "                    normals = meshvis.calculateFaceNormals(vertices, faces))\n",
     "\n",
-    "meshvis.display(mesh, shading='flat', clipping_planes=[meshvis.Plane((1.0, 0.0, 0.0) , 0)])"
+    "ctx = meshvis.Context()\n",
+    "ctx.draw(mesh, shading='flat', clipping_planes=[meshvis.Plane((1.0, 0.0, 0.0) , 0)])\n",
+    "ctx.display()\n",
+    "\n",
+    "ctx.setCameraPosition([0.2, 0, 0])"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {

meshvis/context.py

@@ -41,6 +41,8 @@ class Context(object):
 
         self.click_picker.observe(on_picked, names=['point'])
 
+        self.show_bounds = False
+
     def draw(self, obj, shading='flat', z_offset=0.5, texture=None, point_size = 1, perspective = False, line_width = 1, clipping_planes = []):
         """
         Draw the given object. Not all named parameters are relevant for all object types.
@@ -234,6 +236,27 @@ class Context(object):
         self.scene.add(mesh_obj)
         return self
 
+    def setCameraPosition(self, position):
+        self.camera.position = tuple(position)
+
+    def showBounds(self):
+        self.show_bounds = True
+    
+    def hideBounds(self):
+        self.show_bounds = False
+
+    def setBounds(self, val):
+        self.show_bounds = val
+
+    def draw_text(self, text, position=(0, 0, 0), color='white', size=100, height=1):
+        """
+        Draw a text object at the specified location with a given height
+        """
+        height *= len(text)
+        sm = three.SpriteMaterial(map=three.TextTexture(string=text, color=color, size=size, squareTexture=True))
+        sprite = three.Sprite(material=sm, position=tuple(position), scaleToTexture=True, scale=[height, height, 1])
+        self.scene.add(sprite)
+
     def display(self):
         """
         Display a window containing all the previous draw calls.
@@ -244,4 +267,18 @@ class Context(object):
         self.camera.position = tuple( np.array(self.camera.position) * distance * 5)
         self.orbit_controls.target = tuple(center)
 
+        if self.show_bounds:
+            extends = self.maxCorner - self.minCorner
+            boxEdges = [self.minCorner, 
+                        self.minCorner + [extends[0], 0, 0], 
+                        self.minCorner + [0, extends[1], 0],
+                        self.minCorner + [0, 0, extends[2]]]
+
+            self.draw_edges(boxEdges, [[0, 1], [0, 2], [0, 3]], FaceAttribute([[1, 0, 0], [0, 1, 0], [0, 0, 1]]))
+            self.draw_text(str(map( lambda v: round(v, 3), self.minCorner)), self.minCorner - [0, extends[1]*0.1, 0], color = 'black', height=extends[1]/25)
+            
+            self.draw_text(str(round(extends[0], 3)), (boxEdges[0] * 0.25 + boxEdges[1] * 0.75), color = 'black', height=extends[1]/20)
+            self.draw_text(str(round(extends[1], 3)), (boxEdges[0] * 0.25 + boxEdges[2] * 0.75), color = 'black', height=extends[1]/20)
+            self.draw_text(str(round(extends[2], 3)), (boxEdges[0] * 0.25 + boxEdges[3] * 0.75), color = 'black', height=extends[1]/20)
+
         display(self.renderer)
\ No newline at end of file