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Fixed near plane clipping at wide fields of view; modified calculation of far plane to compute tighter view frustum.

ver1_5_1
Chris Laurel 2002-01-10 07:39:04 +00:00
parent a4729e9753
commit 0bbf45f8cb
1 changed files with 20 additions and 11 deletions
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31
src/celengine/render.cpp
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@ -864,7 +864,7 @@ void Renderer::render(const Observer& observer,
float maxSpan = (float) sqrt(square((float) windowWidth) +
square((float) windowHeight));
nearZ = -nearZ / (float) cos(degToRad(fov / 2)) *
nearZ = -nearZ * (float) cos(degToRad(fov / 2)) *
((float) windowHeight / maxSpan);
if (nearZ > -MinNearPlaneDistance)
@ -880,18 +880,27 @@ void Renderer::render(const Observer& observer,
}
else
{
// Make the far plane as close as possible; the
// calculation used is correct only for spherical bodies,
// though it should work well enough for ellipsoids.
// Make the far plane as close as possible
float d = center.distanceFromOrigin();
// TODO: The factor of 0.5 should not be necessary, but
// we get incorrect clipping without it. Figure out what's
// going on here so that we can use a smaller frustum and
// cull as much as possible.
iter->farZ = -(d - square(radius) / d * 0.5f);
if (iter->farZ < -d)
iter->farZ = -d;
// Account for the oblateness
float eradius = radius;
if (iter->body != NULL)
eradius *= 1.0f - iter->body->getOblateness();
if (d > eradius)
{
// Multiply by a factor to eliminate overaggressive
// clipping due to limited floating point precision
iter->farZ = (float) (sqrt(square(d) -
square(eradius)) * -1.1);
}
else
{
// We're inside the bounding sphere (and, if the planet
// is spherical, inside the planet.)
iter->farZ = iter->nearZ * 2.0f;
}
}
*notCulled = *iter;