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CAMERA: Make the CAMERA_FRUSTUM structure values for nw, nh, fw and fh consistent. 

The CAMERA_FRUSTUM structure values for nw, nh, fw and fh to always mean width and height for both perspective and orthographic views instead of half-width and half-height in perspective.

The orthographic / perspective view toggle has been modified to keep the viewed plane at m_camera_pos_init * m_zoom the same dimensions in both projections.
This commit is contained in:
markus-bonk 2021-06-11 12:31:42 +02:00 committed by Wayne Stambaugh
parent 47603fbc76
commit 5b9f56613e
2 changed files with 35 additions and 34 deletions
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59
3d-viewer/3d_rendering/camera.cpp
View File

@ -120,6 +120,14 @@ void CAMERA::Reset_T1()
m_rotate_aux_t1.z = static_cast<float>( 2.0f * M_PI );
}
void CAMERA::SetBoardLookAtPos( const SFVEC3F& aBoardPos )
{
if( m_board_lookat_pos_init != aBoardPos )
{
m_board_lookat_pos_init = aBoardPos;
SetLookAtPos( aBoardPos );
}
}
void CAMERA::zoomChanged()
{
@ -186,7 +194,6 @@ void CAMERA::rebuildProjection()
m_frustum.nearD = 0.10f;
// Ratio width / height of the window display
m_frustum.angle = 45.0f;
m_projectionMatrix = glm::perspective( glm::radians( m_frustum.angle ), m_frustum.ratio,
@ -199,19 +206,22 @@ void CAMERA::rebuildProjection()
m_focalLen.x = ( (float)m_windowSize.y / (float)m_windowSize.x ) / m_frustum.tang;
m_focalLen.y = 1.0f / m_frustum.tang;
m_frustum.nh = m_frustum.nearD * m_frustum.tang;
m_frustum.nh = 2.0f * m_frustum.nearD * m_frustum.tang;
m_frustum.nw = m_frustum.nh * m_frustum.ratio;
m_frustum.fh = m_frustum.farD * m_frustum.tang;
m_frustum.fh = 2.0f * m_frustum.farD * m_frustum.tang;
m_frustum.fw = m_frustum.fh * m_frustum.ratio;
break;
case PROJECTION_TYPE::ORTHO:
// Keep the viewed plane at (m_camera_pos_init * m_zoom) the same dimensions in both projections.
m_frustum.angle = 45.0f;
m_frustum.tang = glm::tan( glm::radians( m_frustum.angle ) * 0.5f );
m_frustum.nearD = -m_frustum.farD; // Use a symmetrical clip plane for ortho projection
// This formula was found by trial and error
const float orthoReductionFactor = glm::length( m_camera_pos_init ) *
m_zoom * m_zoom * 0.5f;
const float orthoReductionFactor =
glm::length( m_camera_pos_init ) * m_zoom * m_frustum.tang;
// Initialize Projection Matrix for Orthographic View
m_projectionMatrix = glm::ortho( -m_frustum.ratio * orthoReductionFactor,
@ -283,21 +293,26 @@ void CAMERA::updateFrustum()
* http://www.lighthouse3d.com/tutorials/view-frustum-culling/
*/
const SFVEC3F half_right_nw = m_right * m_frustum.nw * 0.5f;
const SFVEC3F half_right_fw = m_right * m_frustum.fw * 0.5f;
const SFVEC3F half_up_nh = m_up * m_frustum.nh * 0.5f;
const SFVEC3F half_up_fh = m_up * m_frustum.fh * 0.5f;
// compute the centers of the near and far planes
m_frustum.nc = m_pos - m_dir * m_frustum.nearD;
m_frustum.fc = m_pos - m_dir * m_frustum.farD;
// compute the 4 corners of the frustum on the near plane
m_frustum.ntl = m_frustum.nc + m_up * m_frustum.nh - m_right * m_frustum.nw;
m_frustum.ntr = m_frustum.nc + m_up * m_frustum.nh + m_right * m_frustum.nw;
m_frustum.nbl = m_frustum.nc - m_up * m_frustum.nh - m_right * m_frustum.nw;
m_frustum.nbr = m_frustum.nc - m_up * m_frustum.nh + m_right * m_frustum.nw;
m_frustum.ntl = m_frustum.nc + half_up_nh - half_right_nw;
m_frustum.ntr = m_frustum.nc + half_up_nh + half_right_nw;
m_frustum.nbl = m_frustum.nc - half_up_nh - half_right_nw;
m_frustum.nbr = m_frustum.nc - half_up_nh + half_right_nw;
// compute the 4 corners of the frustum on the far plane
m_frustum.ftl = m_frustum.fc + m_up * m_frustum.fh - m_right * m_frustum.fw;
m_frustum.ftr = m_frustum.fc + m_up * m_frustum.fh + m_right * m_frustum.fw;
m_frustum.fbl = m_frustum.fc - m_up * m_frustum.fh - m_right * m_frustum.fw;
m_frustum.fbr = m_frustum.fc - m_up * m_frustum.fh + m_right * m_frustum.fw;
m_frustum.ftl = m_frustum.fc + half_up_fh - half_right_fw;
m_frustum.ftr = m_frustum.fc + half_up_fh + half_right_fw;
m_frustum.fbl = m_frustum.fc - half_up_fh - half_right_fw;
m_frustum.fbr = m_frustum.fc - half_up_fh + half_right_fw;
if( ( m_windowSize.x > 0 ) && ( m_windowSize.y > 0 ) )
{
@ -306,16 +321,12 @@ void CAMERA::updateFrustum()
m_up_nY.resize( m_windowSize.y + 1 );
// Precalc X values for camera -> ray generation
const SFVEC3F right_nw = m_right * m_frustum.nw;
for( unsigned int x = 0; x < ( (unsigned int) m_windowSize.x + 1 ); ++x )
m_right_nX[x] = right_nw * m_scr_nX[x];
m_right_nX[x] = half_right_nw * m_scr_nX[x];
// Precalc Y values for camera -> ray generation
const SFVEC3F up_nh = m_up * m_frustum.nh;
for( unsigned int y = 0; y < ( (unsigned int) m_windowSize.y + 1 ); ++y )
m_up_nY[y] = up_nh * m_scr_nY[y];
m_up_nY[y] = half_up_nh * m_scr_nY[y];
}
}
@ -326,18 +337,16 @@ void CAMERA::MakeRay( const SFVEC2I& aWindowPos, SFVEC3F& aOutOrigin,
wxASSERT( aWindowPos.x < m_windowSize.x );
wxASSERT( aWindowPos.y < m_windowSize.y );
const SFVEC3F up_plus_right = m_up_nY[aWindowPos.y] + m_right_nX[aWindowPos.x];
aOutOrigin = m_frustum.nc + m_up_nY[aWindowPos.y] + m_right_nX[aWindowPos.x];
switch( m_projectionType )
{
default:
case PROJECTION_TYPE::PERSPECTIVE:
aOutOrigin = up_plus_right + m_frustum.nc;
aOutDirection = glm::normalize( aOutOrigin - m_pos );
break;
case PROJECTION_TYPE::ORTHO:
aOutOrigin = up_plus_right * 0.5f + m_frustum.nc;
aOutDirection = -m_dir + SFVEC3F( FLT_EPSILON );
break;
}
@ -360,16 +369,16 @@ void CAMERA::MakeRay( const SFVEC2F& aWindowPos, SFVEC3F& aOutOrigin,
m_right_nX[floorWinPos_i.x] * (1.0f - relativeWinPos.x) +
m_right_nX[floorWinPos_i.x + 1] * relativeWinPos.x;
aOutOrigin = up_plus_right + m_frustum.nc;
switch( m_projectionType )
{
default:
case PROJECTION_TYPE::PERSPECTIVE:
aOutOrigin = up_plus_right + m_frustum.nc;
aOutDirection = glm::normalize( aOutOrigin - m_pos );
break;
case PROJECTION_TYPE::ORTHO:
aOutOrigin = up_plus_right * 0.5f + m_frustum.nc;
aOutDirection = -m_dir + SFVEC3F( FLT_EPSILON );
break;
}

10
3d-viewer/3d_rendering/camera.h
View File

@ -109,15 +109,7 @@ public:
float GetNear() const { return m_frustum.nearD; }
float GetFar() const { return m_frustum.farD; }
void SetBoardLookAtPos( const SFVEC3F& aBoardPos )
{
if( m_board_lookat_pos_init != aBoardPos )
{
m_board_lookat_pos_init = aBoardPos;
SetLookAtPos( aBoardPos );
}
}
void SetBoardLookAtPos( const SFVEC3F& aBoardPos );
virtual void SetLookAtPos( const SFVEC3F& aLookAtPos ) = 0;
void SetLookAtPos_T1( const SFVEC3F& aLookAtPos )