/// <summary>
/// Builds a rectangular mesh, centered around the origin.
/// </summary>
public static Mesh Rectangle( Renderer renderer, Color color, float width, float height,
float textureMapTiling)
{
Mesh rectMesh = new Mesh( renderer, 4, 2 );
rectMesh.AddVertex( 0, new Vector3( -width / 2, height / 2, 1.0f ), color,
new Vector2( 0.0f, 0.0f ) );
rectMesh.AddVertex( 1, new Vector3( width / 2, height / 2, 1.0f ), color,
new Vector2( textureMapTiling, 0.0f ) );
rectMesh.AddVertex( 2, new Vector3( width / 2, -height / 2, 1.0f ), color,
new Vector2( textureMapTiling, textureMapTiling ) );
rectMesh.AddVertex( 3, new Vector3( -width / 2, -height / 2, 1.0f ), color,
new Vector2( 0.0f, textureMapTiling ) );
rectMesh.AddTriangle( 0, 0, 1, 2 );
rectMesh.AddTriangle( 1, 0, 2, 3 );
return rectMesh;
}
/// <summary>
/// Builds a circular mesh centered around the origin.
/// </summary>
public static Mesh Circle( Renderer renderer, Color color, float radius,
int numSubdivisions, float textureMapTiling)
{
Mesh circleMesh = new Mesh( renderer, numSubdivisions, numSubdivisions - 2 );
float angleStep = ( 2 * ( float )Math.PI ) / numSubdivisions;
for ( int i = 0; i < numSubdivisions; ++i )
{
Vector2 texCoords = textureMapTiling * ( new Vector2(
( float )Math.Cos( angleStep * i ) / 2.0f + 0.5f,
1.0f - ( ( float )Math.Sin( angleStep * i ) / 2.0f + 0.5f ) ) );
circleMesh.AddVertex( i, new Vector3( radius * ( float )Math.Cos( angleStep * i ),
radius * ( float )Math.Sin( angleStep * i ), 1.0f ), color, texCoords );
}
for ( int i = 2, count = 0; i < numSubdivisions - 1; ++i, ++count )
{
circleMesh.AddTriangle( count, 0, i, i - 1 );
}
circleMesh.AddTriangle( numSubdivisions - 3, 0, numSubdivisions - 2, numSubdivisions - 1 );
return circleMesh;
}