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Pixel perfect panning for the 3D viewer 

Use the correct math to unproject the mouse movement from screen space
to the Z=0 plane on the camera space. This handles both perspective
and orthographic projection at any window size or zoom level.
This commit is contained in:
José Ignacio Romero 2016-09-06 18:43:15 -05:00 committed by Chris Pavlina
parent 03d372a0ec
commit df40159ce7
1 changed files with 14 additions and 8 deletions
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22
3d-viewer/3d_rendering/ctrack_ball.cpp
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@ -96,14 +96,20 @@ void CTRACK_BALL::Pan( const wxPoint &aNewMousePosition )
{
m_parametersChanged = true;
// Current zoom and an additional factor are taken into account
// for the amount of panning.
const float zoom = std::min( m_zoom, 1.0f );
const float panFactor = m_range_scale * zoom * (zoom * 4.0f);
m_camera_pos.x -= panFactor * ( m_lastPosition.x - aNewMousePosition.x ) / m_windowSize.x;
m_camera_pos.y -= panFactor * ( aNewMousePosition.y - m_lastPosition.y ) / m_windowSize.y;
if( m_projectionType == PROJECTION_ORTHO )
{
// With the ortographic projection, there is just a zoom factor
const float panFactor = m_zoom / 37.5f; // Magic number from CCAMERA::rebuildProjection
m_camera_pos.x -= panFactor * ( m_lastPosition.x - aNewMousePosition.x );
m_camera_pos.y -= panFactor * ( aNewMousePosition.y - m_lastPosition.y );
}
else // PROJECTION_PERSPECTIVE
{
// Unproject the coordinates using the precomputed frustum tangent (zoom level dependent)
const float panFactor = -m_camera_pos.z * m_frustum.tang * 2;
m_camera_pos.x -= panFactor * m_frustum.ratio * ( m_lastPosition.x - aNewMousePosition.x ) / m_windowSize.x;
m_camera_pos.y -= panFactor * ( aNewMousePosition.y - m_lastPosition.y ) / m_windowSize.y;
}
updateViewMatrix();
updateFrustum();