/// <summary>
/// Draws a view volume (viewing frustum).
/// </summary>
/// <param name="viewVolume">The view volume.</param>
/// <param name="pose">The pose.</param>
/// <param name="scale">The scale.</param>
/// <param name="color">The color.</param>
/// <param name="drawWireFrame">
/// If set to <see langword="true"/> the wire-frame is drawn; otherwise the mesh is drawn with
/// solid faces.
/// </param>
/// <param name="drawOverScene">
/// If set to <see langword="true"/> the object is drawn over the graphics scene (depth-test
/// disabled).
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="viewVolume"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="NotSupportedException">
/// Drawing solid objects with disabled depth test is not yet supported.
/// </exception>
public void DrawViewVolume(ViewVolume viewVolume, Pose pose, Vector3F scale, Color color, bool drawWireFrame, bool drawOverScene)
{
if (viewVolume == null)
throw new ArgumentNullException("viewVolume");
if (!Enabled)
return;
float left = viewVolume.Left * scale.X;
float right = viewVolume.Right * scale.X;
float bottom = viewVolume.Bottom * scale.Y;
float top = viewVolume.Top * scale.Y;
float near = viewVolume.Near * scale.Z;
float far = viewVolume.Far * scale.Z;
DrawViewVolume(viewVolume is PerspectiveViewVolume, left, right, bottom, top, near, far, pose, color, drawWireFrame, drawOverScene);
}
// Computes the bounding sphere of the given view frustum.
private void GetBoundingSphere(ViewVolume viewVolume, out Vector3F center, out float radius)
{
float left = viewVolume.Left;
float top = viewVolume.Top;
float right = viewVolume.Right;
float bottom = viewVolume.Bottom;
float near = viewVolume.Near;
float far = viewVolume.Far;
_frustumCorners[0] = new Vector3F(left, top, -near);
_frustumCorners[1] = new Vector3F(right, top, -near);
_frustumCorners[2] = new Vector3F(left, bottom, -near);
_frustumCorners[3] = new Vector3F(right, bottom, -near);
float farOverNear = far / near;
left *= farOverNear;
top *= farOverNear;
right *= farOverNear;
bottom *= farOverNear;
_frustumCorners[4] = new Vector3F(left, top, -far);
_frustumCorners[5] = new Vector3F(right, top, -far);
_frustumCorners[6] = new Vector3F(left, bottom, -far);
_frustumCorners[7] = new Vector3F(right, bottom, -far);
GeometryHelper.ComputeBoundingSphere(_frustumCorners, out radius, out center);
}
/// <overloads>
/// <summary>
/// Draws a view volume (viewing frustum).
/// </summary>
/// </overloads>
///
/// <summary>
/// Draws a view volume (viewing frustum).
/// </summary>
/// <param name="viewVolume">The view volume.</param>
/// <param name="pose">The pose.</param>
/// <param name="color">The color.</param>
/// <param name="drawWireFrame">
/// If set to <see langword="true"/> the wire-frame is drawn; otherwise the mesh is drawn with
/// solid faces.
/// </param>
/// <param name="drawOverScene">
/// If set to <see langword="true"/> the object is drawn over the graphics scene (depth-test
/// disabled).
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="viewVolume"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="NotSupportedException">
/// Drawing solid objects with disabled depth test is not yet supported.
/// </exception>
public void DrawViewVolume(ViewVolume viewVolume, Pose pose, Color color, bool drawWireFrame, bool drawOverScene)
{
if (viewVolume == null)
throw new ArgumentNullException("viewVolume");
DrawViewVolume(viewVolume is PerspectiveViewVolume, viewVolume.Left, viewVolume.Right, viewVolume.Bottom, viewVolume.Top, viewVolume.Near, viewVolume.Far, pose, color, drawWireFrame, drawOverScene);
}
