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0025760: Visualization - precision factor added to ZNear, ZFar in method ZFitAll() of Graphic3d_Camera is not enough

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Partial fix: increased epsilon to value reported in #0025670
This commit is contained in:
apl 2015-05-07 15:00:23 +03:00 committed by abv
parent 30a7308729
commit 35c4a17c46
1 changed files with 25 additions and 31 deletions
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56
src/Graphic3d/Graphic3d_Camera.cxx
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@ -986,29 +986,27 @@ void Graphic3d_Camera::ZFitAll (const Standard_Real theScaleFactor, const Bnd_Bo
// fixed using tolerance distance, relative to boundaries size. The tolerance distance
// should be computed using information on boundaries of primary application actors,
// (e.g. representing the displayed model) - to ensure that they are not unreasonably clipped.
const Standard_ShortReal anEpsilon = 1e-4;
if (theGraphicBB.IsVoid())
{
// ShortReal precision factor used to add meaningful tolerance to
// Precision factor used to add meaningful tolerance to
// ZNear, ZFar values in order to avoid equality after type conversion
// to ShortReal matrices type.
const Standard_Real aPrecision = 1.0 / Pow (10.0, ShortRealDigits() - 1);
Standard_Real aZFar = Distance() * 3.0;
Standard_Real aZNear = 0.0;
if (!IsOrthographic())
{
if (aZFar < aPrecision)
if (aZFar < anEpsilon)
{
// Invalid case when both values are negative
aZNear = aPrecision;
aZFar = aPrecision * 2.0;
aZNear = anEpsilon;
aZFar = anEpsilon * 2.0;
}
else if (aZNear < Abs (aZFar) * aPrecision)
else if (aZNear < aZFar * anEpsilon)
{
// Z is less than 0.0, try to fix it using any appropriate z-scale
aZNear = Abs (aZFar) * aPrecision;
aZNear = aZFar * anEpsilon;
}
}
@ -1090,22 +1088,20 @@ void Graphic3d_Camera::ZFitAll (const Standard_Real theScaleFactor, const Bnd_Bo
Standard_Real aMidDepth = (aGraphicMinDist + aGraphicMaxDist) * 0.5;
Standard_Real aHalfDepth = (aGraphicMaxDist - aGraphicMinDist) * 0.5;
// ShortReal precision factor used to add meaningful tolerance to
// ZNear, ZFar values in order to avoid equality after type conversion
// to ShortReal matrices type.
const Standard_Real aPrecision = Pow (0.1, ShortRealDigits() - 2);
// Compute enlarged or shrank near and far z ranges
Standard_Real aZNear = aMidDepth - aHalfDepth * theScaleFactor;
Standard_Real aZFar = aMidDepth + aHalfDepth * theScaleFactor;
aZNear -= aPrecision * 0.5;
aZFar += aPrecision * 0.5;
Standard_Real aZNear = aMidDepth - aHalfDepth * theScaleFactor;
Standard_Real aZFar = aMidDepth + aHalfDepth * theScaleFactor;
Standard_Real aZRange = Abs (aZFar - aZNear);
Standard_Real aZConf = Max (static_cast <Standard_Real> (anEpsilon * aZRange),
static_cast <Standard_Real> (anEpsilon));
aZNear -= Abs (aZNear) * anEpsilon + aZConf;
aZFar += Abs (aZFar) * anEpsilon + aZConf;
if (!IsOrthographic())
{
if (aZFar >= aPrecision)
if (aZFar > anEpsilon)
{
// To avoid numeric errors... (See comments in the beginning of the method).
// Choose between model distance and graphical distance, as the model boundaries
// might be infinite if all structures have infinite flag.
const Standard_Real aGraphicDepth = aGraphicMaxDist >= aGraphicMinDist
@ -1115,25 +1111,23 @@ void Graphic3d_Camera::ZFitAll (const Standard_Real theScaleFactor, const Bnd_Bo
? aModelMaxDist - aModelMinDist : RealLast();
const Standard_Real aMinDepth = Min (aModelDepth, aGraphicDepth);
const Standard_Real aZTolerance =
Max (Abs (aMinDepth) * aPrecision, aPrecision);
if (aZNear < aZTolerance)
const Standard_Real aZTol = Max (static_cast<Standard_Real> (anEpsilon * Abs (aMinDepth)),
static_cast<Standard_Real> (anEpsilon));
if (aZNear < aZTol)
{
aZNear = aZTolerance;
aZNear = aZTol;
}
}
else // aZFar < aPrecision - Invalid case when both ZNear and ZFar are negative
else
{
aZNear = aPrecision;
aZFar = aPrecision * 2.0;
aZNear = anEpsilon;
aZFar = anEpsilon * 2.0;
}
}
// If range is too small
if (aZFar < (aZNear + Abs (aZFar) * aPrecision))
if (aZFar < (aZNear + Abs (aZFar) * anEpsilon))
{
aZFar = aZNear + Abs (aZFar) * aPrecision;
aZFar = aZNear + Abs (aZFar) * anEpsilon;
}
SetZRange (aZNear, aZFar);