void ZoaDebugFunctions::calculateTriMeshNormals( ci::TriMesh &mesh )
{
const std::vector<ci::Vec3f>& vertices = mesh.getVertices();
const std::vector<uint32_t>& indices = mesh.getIndices();
// remove all current normals
std::vector<ci::Vec3f>& normals = mesh.getNormals();
normals.reserve( mesh.getNumVertices() );
normals.clear();
// set the normal for each vertex to (0, 0, 0)
for(size_t i=0; i < mesh.getNumVertices(); ++i)
normals.push_back( ci::Vec3f::zero() );
// Average out the normal for each vertex at an index
for(size_t i=0; i< mesh.getNumTriangles(); ++i)
{
ci::Vec3f v0 = vertices[ indices[i * 3] ];
ci::Vec3f v1 = vertices[ indices[i * 3 + 1] ];
ci::Vec3f v2 = vertices[ indices[i * 3 + 2] ];
// calculate normal and normalize it, so each of the normals equally contributes to the final result
ci::Vec3f e0 = v2 - v0;
ci::Vec3f e1 = v2 - v1;
ci::Vec3f n = e0.cross(e1).normalized();
// add the normal to the final result, so we get an average of the normals of each triangle
normals[ indices[i * 3] ] += n;
normals[ indices[i * 3 + 1] ] += n;
normals[ indices[i * 3 + 2] ] += n;
}
// the normals are probably not normalized by now, so make sure their lengths will be 1.0 as expected
for(size_t i=0;i< normals.size();++i) {
normals[i].normalize();
}
}
void DelaunayMeshMaker::draw()
{
gl::clear();
gl::pushMatrices();
gl::pushModelView();
gl::color( ColorA::white() );
if( mMesh.getNumTriangles() > 0 ){
if( mApplyPhongShading )
mPhongShader.bind();
gl::enableDepthRead();
gl::enableDepthWrite();
gl::disableAlphaBlending();
if( mDrawWireframe )
gl::enableWireframe();
gl::draw( mVboMesh );
if( mDrawWireframe )
gl::disableWireframe();
if( mApplyPhongShading )
mPhongShader.unbind();
}
if( mAlpha > 0.0f ){
gl::disableDepthRead();
gl::disableDepthWrite();
gl::enableAlphaBlending();
gl::color( ColorA( 1,1,1, mAlpha ) );
gl::draw( mSurface );
}
gl::popModelView();
gl::popMatrices();
if( mTesselator->isRunning() ){
gl::disableDepthRead();
gl::disableDepthWrite();
gl::enableAlphaBlending();
gl::color( ColorA(0.0f, 0.0f, 0.0f, 0.5f ) );
gl::drawSolidRect( Rectf( 0, 0, app::getWindowWidth(), app::getWindowHeight() ) );
gl::pushModelView();
gl::translate( app::getWindowSize()/2 );
double time = getElapsedSeconds();
double fraction = time - (int) time;
int numFractions = 12;
for(int i=0;i<numFractions;++i) {
float a = (float) (fraction + i * (1.0f / (float)numFractions));
a -= (int) a;
gl::pushModelView();
gl::rotate( i * ( -360.0f/(float)numFractions ) );
gl::color( ColorA(1,1,1,1-a) );
gl::drawSolidRect( Rectf(-6.0f, -44.0f, +6.0f, -31.0f) );
gl::popModelView();
}
gl::popModelView();
}
mParams.draw();
}