Hi,
Is there a way to get the 8 corners position of the camera view Frustum, I know that GetFrustum() returns the 6 planes of the view Frustum, but is there a way to get the 8 corners of the Bounding view Frustum near to far view in global space or how can I construct the 8 corners base on the 6 planes ?
Something like this:
Many thanks in advanced and advice are appreciated,
Dex
It seems that I don't need to roll my own frustum view Plane has a built in intersection to AABB
Finally I got it, if any one is interested see the code below C# tho : )
/// <summary>
/// Draw from Near rect is from Screen Projection and far is computed from setting.
/// </summary>
private void DrawViewFrustum()
{
float m_FarOffset = _Camera.Far;
float m_NearOffset = _Camera.Near;
float m_ScreenWidth = _Camera.GetViewport().Size.x;
float m_ScreenHeight = _Camera.GetViewport().Size.y;
//
float m_AspectRatio = (m_ScreenWidth > m_ScreenHeight)? (m_ScreenWidth / m_ScreenHeight) : (m_ScreenHeight / m_ScreenWidth);
//
float m_FarHeight = 2.0f * ((float)Math.Tan(_Camera.Fov / 2.0f)) * m_FarOffset;
float m_FarWidth = m_FarOffset * m_AspectRatio;
//
m_FarHeight = m_FarHeight + (( m_FarHeight/ 7) * 3);
m_FarWidth = m_FarWidth + (( m_FarWidth / 7) * 3);
//
Vector3 m_Forward = _Camera.GlobalTransform.origin + Vector3.Forward * m_FarOffset;
//--> Near World
//
Vector3 m_NearTopLeft = _Camera.ProjectPosition(new Vector2(0, 0), _Camera.Near);
Vector3 m_NearTopRight = _Camera.ProjectPosition(new Vector2(m_ScreenWidth, 0), _Camera.Near);
Vector3 m_NearBottomLeft = _Camera.ProjectPosition(new Vector2(0, m_ScreenHeight), _Camera.Near);
Vector3 m_NearBottomRight = _Camera.ProjectPosition(new Vector2(m_ScreenWidth, m_ScreenHeight), _Camera.Near);
//--> Far LOCAL
//
Vector3 m_FarTopLeft = m_Forward + (Vector3.Up * m_FarHeight / 2.0f) - (Vector3.Right * m_FarWidth / 2.0f);
Vector3 m_FarTopRight = m_Forward + (Vector3.Up * m_FarHeight / 2.0f) + (Vector3.Right * m_FarWidth / 2.0f);
Vector3 m_FarBottomLeft = m_Forward - (Vector3.Up * m_FarHeight / 2.0f) - (Vector3.Right * m_FarWidth / 2.0f);
Vector3 m_FarBottomRight = m_Forward - (Vector3.Up * m_FarHeight / 2.0f) + (Vector3.Right * m_FarWidth / 2.0f);
//
//--> Far WORLD
//
m_FarTopLeft = _Camera.Transform.Xform(m_FarTopLeft);
m_FarTopRight = _Camera.Transform.Xform(m_FarTopRight);
m_FarBottomRight = _Camera.Transform.Xform(m_FarBottomRight);
m_FarBottomLeft = _Camera.Transform.Xform(m_FarBottomLeft);
//--> Draw lines
//
ZC.FromToPoints[] m_Lines = new ZC.FromToPoints[12];
//
// Far rect lines
m_Lines[0].FromPoint = m_FarTopLeft;
m_Lines[0].ToPoint = m_FarTopRight;
//
m_Lines[1].FromPoint = m_FarTopRight;
m_Lines[1].ToPoint = m_FarBottomRight;
//
m_Lines[2].FromPoint = m_FarBottomRight;
m_Lines[2].ToPoint = m_FarBottomLeft;
//
m_Lines[3].FromPoint = m_FarBottomLeft;
m_Lines[3].ToPoint = m_FarTopLeft;
//
// Near rect lines
m_Lines[4].FromPoint = m_NearTopLeft;
m_Lines[4].ToPoint = m_NearTopRight;
//
m_Lines[5].FromPoint = m_NearTopRight;
m_Lines[5].ToPoint = m_NearBottomRight;
//
m_Lines[6].FromPoint = m_NearBottomRight;
m_Lines[6].ToPoint = m_NearBottomLeft;
//
m_Lines[7].FromPoint = m_NearBottomLeft;
m_Lines[7].ToPoint = m_NearTopLeft;
//
// Left lines
m_Lines[8].FromPoint = m_NearTopLeft;
m_Lines[8].ToPoint = m_FarTopLeft;
//
m_Lines[9].FromPoint = m_NearBottomLeft;
m_Lines[9].ToPoint = m_FarBottomLeft;
//
// Right lines
m_Lines[10].FromPoint = m_NearTopRight;
m_Lines[10].ToPoint = m_FarTopRight;
//
m_Lines[11].FromPoint = m_NearBottomRight;
m_Lines[11].ToPoint = m_FarBottomRight;
//--> Create 3d Line
//
_3DLineMngr.Create(this, m_Lines, Color.ColorN("green", 1));
}