About Point Picker Example

--

Learning Objectives

This openFrameworks example demonstrates how to load a .ply file ( Polygon File Format ) into a mesh. Each of the points are identifible with their index exposed by mousing near it.

In the code, pay attention to:

• ofSetVerticalSync to synchronize the redraw of the screen to the vertical refresh of your screen
• mesh.load("lofi-bunny.ply") to load a .ply file into the mesh
• Creation of the wireframe in the mesh using ```mesh.drawWireFrame()````
• Setting of the point size with glPointSize(2)
• Drawing of the vertices by the mesh using mesh.drawVertices
• Use of a camera to render the scene with cam.begin() and cam.end()
• Conversion of the vertex from the mesh to screen coordinates to evaluate distance from the mouse with cam.worldToScreen(mesh.getVertex(i))
• Using cur.distance(mouse) to determine distance between the mouse coordinates and that of the vertex. Lowest distance is identified as the nearest vertex to the mouse.
• Drawing of line from the nearest vertex to the mouse using ofDrawLine(nearestVertex,mouse)

Expected Behavior

When launching this app, you should see

• A mesh that reflects a low polygon bunny model with points and flat polygons drawn.

Instructions for use:

• Move the mouse near the points in the mesh to see their index number