public override void SetConstants(IGraphicsContext context)
{
// set camera parameters
var camera = context.CurrentCamera;
Effect.Parameters["wPosCamera"].SetValue(camera.Position);
Effect.Parameters["near_plane"].SetValue((float)camera.NearPlane);
Effect.Parameters["far_plane"].SetValue((float)camera.FarPlane);
Effect.Parameters["fov"].SetValue((float)camera.FieldOfView);
Vector3D[] frustumCornersWS = new Vector3D[8];
Vector3D[] farFrustumCornersWS = new Vector3D[4];
Vector3D[] farFrustumCornersVS = new Vector3D[4];
MatrixD view = camera.ViewD;
BoundingFrustumD frustum = new BoundingFrustumD(context.RenderContext.ViewProjD);
frustum.GetCorners(frustumCornersWS);
// 2 ____________ 1
// | |
// | |
// | |
// 3|____________| 0
//
for (int i = 4; i < 8; i++)
{
farFrustumCornersWS[i - 4] = frustumCornersWS[i];
}
Vector3D.TransformCoordinate(farFrustumCornersWS, ref view, farFrustumCornersVS);
Vector3D[] o = new Vector3D[4];
Vector4D[] o4 = new Vector4D[4];
for (int i = 0; i < 4; i++)
{
Vector3D.Normalize(ref farFrustumCornersVS[i], out o[i]);
o4[i] = new Vector4D(o[i], 1.0);
}
Effect.Parameters["frustumCornersVS"].SetValue(o4.Select(v => v.ToVector4()).ToArray());
view.Invert();
Effect.Parameters["IView"].SetValue(view.ToMatrix());
// set sun parameters
Effect.Parameters["sunVector"].SetValue(new Vector3(0, 0, 1));
}
public static LineD[] GetLines(this BoundingFrustumD frust)
{
var corners = new Vector3D[8];
frust.GetCorners(corners);
var lines = new LineD[12];
lines[0] = new LineD(corners[0], corners[1]);
lines[1] = new LineD(corners[1], corners[2]);
lines[2] = new LineD(corners[2], corners[3]);
lines[3] = new LineD(corners[3], corners[0]);
lines[4] = new LineD(corners[4], corners[5]);
lines[5] = new LineD(corners[5], corners[6]);
lines[6] = new LineD(corners[6], corners[7]);
lines[7] = new LineD(corners[7], corners[4]);
lines[8] = new LineD(corners[0], corners[4]);
lines[9] = new LineD(corners[1], corners[5]);
lines[10] = new LineD(corners[2], corners[6]);
lines[11] = new LineD(corners[3], corners[7]);
return(lines);
}
public static void DrawBoundingFrustum(BoundingFrustumD boundingFrustum, Color color)
{
boundingFrustum.GetCorners(m_frustumCorners);
m_lineBatch.Begin();
// near face
m_lineBatch.DrawLine(m_frustumCorners[0], m_frustumCorners[1], color);
m_lineBatch.DrawLine(m_frustumCorners[1], m_frustumCorners[2], color);
m_lineBatch.DrawLine(m_frustumCorners[2], m_frustumCorners[3], color);
m_lineBatch.DrawLine(m_frustumCorners[3], m_frustumCorners[0], color);
// far face
m_lineBatch.DrawLine(m_frustumCorners[4], m_frustumCorners[5], color);
m_lineBatch.DrawLine(m_frustumCorners[5], m_frustumCorners[6], color);
m_lineBatch.DrawLine(m_frustumCorners[6], m_frustumCorners[7], color);
m_lineBatch.DrawLine(m_frustumCorners[7], m_frustumCorners[4], color);
// top,right,bottom,left face
m_lineBatch.DrawLine(m_frustumCorners[0], m_frustumCorners[4], color);
m_lineBatch.DrawLine(m_frustumCorners[1], m_frustumCorners[5], color);
m_lineBatch.DrawLine(m_frustumCorners[2], m_frustumCorners[6], color);
m_lineBatch.DrawLine(m_frustumCorners[3], m_frustumCorners[7], color);
m_lineBatch.End();
}