| 46 | IE_CORE_DEFINERUNTIMETYPED( DiskPrimitive ); |
| 47 | |
| 48 | DiskPrimitive::DiskPrimitive( float radius, float z, float thetaMax ) |
| 49 | : m_radius( radius ), m_z( z ), m_thetaMax( thetaMax ), m_nPoints( 0 ) |
| 50 | { |
| 51 | |
| 52 | // build vertex attributes for P, N and st, and indexes for triangles. |
| 53 | |
| 54 | IECore::V3fVectorDataPtr pData = new IECore::V3fVectorData; |
| 55 | IECore::V3fVectorDataPtr nData = new IECore::V3fVectorData; |
| 56 | IECore::V2fVectorDataPtr uvData = new IECore::V2fVectorData; |
| 57 | |
| 58 | vector<V3f> &pVector = pData->writable(); |
| 59 | vector<V3f> &nVector = nData->writable(); |
| 60 | vector<V2f> &uvVector = uvData->writable(); |
| 61 | |
| 62 | // centre point |
| 63 | pVector.push_back( V3f( 0.0f, 0.0f, m_z ) ); |
| 64 | nVector.push_back( V3f( 0.0f, 0.0f, 1.0f ) ); |
| 65 | uvVector.push_back( V2f( 0.5f, 0.5f ) ); |
| 66 | |
| 67 | const unsigned int n = 20; |
| 68 | float thetaMaxRadians = m_thetaMax/180.0f * M_PI; |
| 69 | for( unsigned int i=0; i<n; i++ ) |
| 70 | { |
| 71 | float t = thetaMaxRadians * i/(n-1); |
| 72 | float x = cosf( t ); |
| 73 | float y = sinf( t ); |
| 74 | pVector.push_back( V3f( m_radius * x, m_radius * y, m_z ) ); |
| 75 | nVector.push_back( V3f( 0.0f, 0.0f, 1.0f ) ); |
| 76 | uvVector.push_back( V2f( x/2.0f + 0.5f, y/2.0f + 0.5f ) ); |
| 77 | } |
| 78 | |
| 79 | m_nPoints = n + 1; |
| 80 | |
| 81 | addVertexAttribute( "P", pData ); |
| 82 | addVertexAttribute( "N", nData ); |
| 83 | addVertexAttribute( "uv", uvData ); |
| 84 | } |
| 85 | |
| 86 | DiskPrimitive::~DiskPrimitive() |
| 87 | { |