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#168 Improved the front and back clipping plane calculation in relation to parallel projection.

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Added a margin of 20% to account for inaccuracies. Not new for far-plane, but became missing in the first commit regarding parallel projection.
This commit is contained in:
Jacob Støren 2016-08-15 16:11:38 +02:00
parent c529e18351
commit a3499152a5
1 changed files with 31 additions and 9 deletions
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34
Fwk/AppFwk/cafViewer/cafViewer.cpp
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@ -273,31 +273,53 @@ void caf::Viewer::optimizeClippingPlanes()
cvf::Vec3d bboxCorners[8]; cvf::Vec3d bboxCorners[8];
bb.cornerVertices(bboxCorners); bb.cornerVertices(bboxCorners);
// Find the distance to the bbox corners most behind and most in front of camera
double maxDistEyeToCornerAlongViewDir = -HUGE_VAL; double maxDistEyeToCornerAlongViewDir = -HUGE_VAL;
double minDistEyeToCornerAlongViewDir = HUGE_VAL; double minDistEyeToCornerAlongViewDir = HUGE_VAL;
for (int bcIdx = 0; bcIdx < 8; ++bcIdx ) for (int bcIdx = 0; bcIdx < 8; ++bcIdx )
{ {
double distEyeBoxCornerAlongViewDir = (bboxCorners[bcIdx] - eye)*viewdir; double distEyeBoxCornerAlongViewDir = (bboxCorners[bcIdx] - eye)*viewdir;
if (distEyeBoxCornerAlongViewDir > maxDistEyeToCornerAlongViewDir) if (distEyeBoxCornerAlongViewDir > maxDistEyeToCornerAlongViewDir)
{
maxDistEyeToCornerAlongViewDir = distEyeBoxCornerAlongViewDir; maxDistEyeToCornerAlongViewDir = distEyeBoxCornerAlongViewDir;
if (distEyeBoxCornerAlongViewDir < minDistEyeToCornerAlongViewDir)
minDistEyeToCornerAlongViewDir = distEyeBoxCornerAlongViewDir;
} }
double farPlaneDist = CVF_MIN(maxDistEyeToCornerAlongViewDir, m_maxFarPlaneDistance); if (distEyeBoxCornerAlongViewDir < minDistEyeToCornerAlongViewDir)
double nearPlaneDist = minDistEyeToCornerAlongViewDir; {
minDistEyeToCornerAlongViewDir = distEyeBoxCornerAlongViewDir; // Sometimes negative-> behind camera
}
}
double farPlaneDist = CVF_MIN(maxDistEyeToCornerAlongViewDir * 1.2, m_maxFarPlaneDistance);
// Near-plane:
bool isOrthoNearPlaneFollowingCamera = false; bool isOrthoNearPlaneFollowingCamera = false;
double nearPlaneDist = HUGE_VAL;
// If we have perspective projection, set the near plane just in front of camera, and not behind
if (m_mainCamera->projection() == cvf::Camera::PERSPECTIVE || isOrthoNearPlaneFollowingCamera) if (m_mainCamera->projection() == cvf::Camera::PERSPECTIVE || isOrthoNearPlaneFollowingCamera)
{ {
if (nearPlaneDist < m_minNearPlaneDistance) nearPlaneDist = m_minNearPlaneDistance; nearPlaneDist = CVF_MAX( m_minNearPlaneDistance, minDistEyeToCornerAlongViewDir);
if (m_navigationPolicy.notNull() && m_navigationPolicyEnabled) if (m_navigationPolicy.notNull() && m_navigationPolicyEnabled)
{ {
double pointOfInterestDist = (eye - m_navigationPolicy->pointOfInterest()).length(); double pointOfInterestDist = (eye - m_navigationPolicy->pointOfInterest()).length();
nearPlaneDist = CVF_MIN(nearPlaneDist, pointOfInterestDist*0.2); nearPlaneDist = CVF_MIN(nearPlaneDist, pointOfInterestDist*0.2);
} }
}
else // Orthographic projection. Set to encapsulate the complete boundingbox, possibly setting a negative nearplane
{
if(minDistEyeToCornerAlongViewDir >= 0)
{
nearPlaneDist = CVF_MIN(0.8 * minDistEyeToCornerAlongViewDir, m_maxFarPlaneDistance);
}
else
{
nearPlaneDist = CVF_MAX(1.2 * minDistEyeToCornerAlongViewDir, -m_maxFarPlaneDistance);
}
} }
#if 0 #if 0