/// <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 centerColor, Color rimColor, float radius,
int numSubdivisions)
{
Mesh circleMesh = new Mesh(renderer, numSubdivisions, numSubdivisions - 2);
float angleStep = (2 * (float)Math.PI) / numSubdivisions;
for (int i = 0; i < numSubdivisions; ++i)
{
circleMesh.AddVertex(i, new Vector3(radius * (float)Math.Cos(angleStep * i),
radius * (float)Math.Sin(angleStep * i), 1.0f), rimColor, new Vector2());
}
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;
}
