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ofxOpenGP

OpenFrameworks addon to use OpenGP (Open Geometry Processing).

image

Usage

#include "ofxOpenGP.h"

// 1. Create your Surface_mesh instance
opengp::Surface_mesh mesh;
mesh.load("data/bunny.obj");

// 2. Play with your instance using OpenGP
...

// 3. Convert to ofMesh / ofVboMesh
ofMesh newMesh;
ofxOpenGP::convert(mesh, newMesh);

For a more comprehensive case, look at the two projects in example-simple/ and example-visualize/.

Advanced Usage

ofxOpenGP ships several utility functions to visualize the quality of a mesh.

TODO give a list and explain them.

FAQ

Q. My mesh looks ugly with ofEasyCam, what should I do?

A. First, you may want to normalize it using ofxOpenGP::normalize. This method translates the bounding box center to the origin, and then rescale the mesh to have a maximum width of 1.0f.

As such, it will look tiny when using ofMesh because ofEasyCam doesn't expect a 1-box mesh. You can either

  • rescale it specifically (see ofxOpenGP::normalize and ofxOpenGP::rescale),
  • change your camera settings, or
  • automatically scale it using the settings of ofxOpenGP::convert such as in the example:
float scale = 0.5f * std::min(ofGetWidth(), ofGetHeight());
ofxOpenGP::convert(mesh, newMesh, scale);

// or with other settings
ofxOpenGP::Settings settings; // setup
settings << scale;
ofxOpenGP::convert(mesh, newMesh, settings);

Q. My mesh is a polygonal mesh with fancy face valences, what can I do?

A. OpenGP automatically triangulate meshes in the conversion using Surface_mesh::triangulate if needed. While quad meshes are easy and mostly safe, this may not be the case for general polygons. You may want to take care of the topology yourself beforehand.

Q. Can you tell us more about ofxOpenGP::convert?

A. Here it is:

bool ofxOpenGP::convert(opengp::Surface_mesh &mesh,
                        ofMesh &newMesh,
                        ofxOpenGP::Settings settings);
  • mesh: your surface mesh from OpenGP (not const as we use triangulate when needed)
  • newMesh: your ofMesh for an easy display within OpenFrameworks
  • settings: settings made of
    • meshType, one of OFX_AUTO_MESH, OFX_TRIANGLE_MESH and OFX_QUAD_MESH
    • colorType, one of OFX_AUTO_COLORS, OFX_VERTEX_COLORS, OFX_FACE_COLORS and OFX_NO_COLORS
    • meshScaling, a factor by which to scale the vertex positions (because of ofEasyCam)
  • returns true if it worked without error, false in case an error occurred

License

Released under the MIT License.

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OpenFrameworks addon to use OpenGP (Open Geometry Processing)

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