2004-05-30 02:46:58 +02:00
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//***********************************************************
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//
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// Name: Camera.Cpp
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// Last Update: 24/2/02
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// Author: Poya Manouchehri
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//
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// Description: CCamera holds a view and a projection matrix.
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// It also has a frustum which can be used to
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// cull objects for rendering.
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//
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//***********************************************************
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2004-06-03 20:38:14 +02:00
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#include "precompiled.h"
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2004-05-30 02:46:58 +02:00
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#include "Camera.h"
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CCamera::CCamera ()
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{
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// set viewport to something anything should handle, but should be initialised
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// to window size before use
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m_ViewPort.m_X = 0;
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m_ViewPort.m_Y = 0;
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m_ViewPort.m_Width = 800;
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m_ViewPort.m_Height = 600;
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}
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CCamera::~CCamera ()
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{
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}
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void CCamera::SetProjection (float nearp, float farp, float fov)
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{
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float h, w, Q;
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m_NearPlane = nearp;
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m_FarPlane = farp;
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m_FOV = fov;
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float Aspect = (float)m_ViewPort.m_Width/(float)m_ViewPort.m_Height;
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w = 1/tanf (fov*0.5f*Aspect);
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h = 1/tanf (fov*0.5f);
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Q = m_FarPlane / (m_FarPlane - m_NearPlane);
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m_ProjMat.SetZero ();
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m_ProjMat._11 = w;
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m_ProjMat._22 = h;
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m_ProjMat._33 = (m_FarPlane+m_NearPlane)/(m_FarPlane-m_NearPlane);;
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m_ProjMat._34 = -2*m_FarPlane*m_NearPlane/(m_FarPlane-m_NearPlane);
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m_ProjMat._43 = 1.0f;
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}
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//Updates the frustum planes. Should be called
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//everytime the view or projection matrices are
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//altered.
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void CCamera::UpdateFrustum ()
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{
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CMatrix3D MatFinal;
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CMatrix3D MatView;
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m_Orientation.GetInverse(MatView);
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MatFinal = m_ProjMat * MatView;
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//get the RIGHT plane
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m_ViewFrustum.SetNumPlanes (6);
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m_ViewFrustum.m_aPlanes[0].m_Norm.X = MatFinal._41-MatFinal._11;
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m_ViewFrustum.m_aPlanes[0].m_Norm.Y = MatFinal._42-MatFinal._12;
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m_ViewFrustum.m_aPlanes[0].m_Norm.Z = MatFinal._43-MatFinal._13;
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m_ViewFrustum.m_aPlanes[0].m_Dist = MatFinal._44-MatFinal._14;
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//get the LEFT plane
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m_ViewFrustum.m_aPlanes[1].m_Norm.X = MatFinal._41+MatFinal._11;
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m_ViewFrustum.m_aPlanes[1].m_Norm.Y = MatFinal._42+MatFinal._12;
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m_ViewFrustum.m_aPlanes[1].m_Norm.Z = MatFinal._43+MatFinal._13;
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m_ViewFrustum.m_aPlanes[1].m_Dist = MatFinal._44+MatFinal._14;
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//get the BOTTOM plane
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m_ViewFrustum.m_aPlanes[2].m_Norm.X = MatFinal._41+MatFinal._21;
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m_ViewFrustum.m_aPlanes[2].m_Norm.Y = MatFinal._42+MatFinal._22;
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m_ViewFrustum.m_aPlanes[2].m_Norm.Z = MatFinal._43+MatFinal._23;
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m_ViewFrustum.m_aPlanes[2].m_Dist = MatFinal._44+MatFinal._24;
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//get the TOP plane
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m_ViewFrustum.m_aPlanes[3].m_Norm.X = MatFinal._41-MatFinal._21;
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m_ViewFrustum.m_aPlanes[3].m_Norm.Y = MatFinal._42-MatFinal._22;
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m_ViewFrustum.m_aPlanes[3].m_Norm.Z = MatFinal._43-MatFinal._23;
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m_ViewFrustum.m_aPlanes[3].m_Dist = MatFinal._44-MatFinal._24;
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//get the FAR plane
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m_ViewFrustum.m_aPlanes[4].m_Norm.X = MatFinal._41-MatFinal._31;
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m_ViewFrustum.m_aPlanes[4].m_Norm.Y = MatFinal._42-MatFinal._32;
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m_ViewFrustum.m_aPlanes[4].m_Norm.Z = MatFinal._43-MatFinal._33;
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m_ViewFrustum.m_aPlanes[4].m_Dist = MatFinal._44-MatFinal._34;
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//get the NEAR plane
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m_ViewFrustum.m_aPlanes[5].m_Norm.X = MatFinal._41+MatFinal._31;
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m_ViewFrustum.m_aPlanes[5].m_Norm.Y = MatFinal._42+MatFinal._32;
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m_ViewFrustum.m_aPlanes[5].m_Norm.Z = MatFinal._43+MatFinal._33;
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m_ViewFrustum.m_aPlanes[5].m_Dist = MatFinal._44+MatFinal._34;
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}
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void CCamera::SetViewPort (SViewPort *viewport)
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{
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m_ViewPort.m_X = viewport->m_X;
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m_ViewPort.m_Y = viewport->m_Y;
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m_ViewPort.m_Width = viewport->m_Width;
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m_ViewPort.m_Height = viewport->m_Height;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// GetCameraPlanePoints: return four points in camera space at given distance from camera
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void CCamera::GetCameraPlanePoints(float dist,CVector3D pts[4]) const
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{
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float aspect=float(m_ViewPort.m_Width)/float(m_ViewPort.m_Height);
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float x=dist*float(tan(GetFOV()*aspect*0.5));
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float y=dist*float(tan(GetFOV()*0.5));
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pts[0].X=-x;
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pts[0].Y=-y;
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pts[0].Z=dist;
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pts[1].X=x;
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pts[1].Y=-y;
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pts[1].Z=dist;
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pts[2].X=x;
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pts[2].Y=y;
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pts[2].Z=dist;
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pts[3].X=-x;
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pts[3].Y=y;
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pts[3].Z=dist;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// GetFrustumPoints: calculate and return the position of the 8 points of the frustum in world space
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void CCamera::GetFrustumPoints(CVector3D pts[8]) const
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{
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// get camera space points for near and far planes
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CVector3D cpts[8];
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GetCameraPlanePoints(m_NearPlane,pts);
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GetCameraPlanePoints(m_FarPlane,pts+4);
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// transform to world space
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for (int i=0;i<8;i++) {
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m_Orientation.Transform(cpts[i],pts[i]);
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}
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}
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