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- Use tests less prone to overflow on very steep slopes when detecting which side of a plane

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the camera is on. Mostly, this means testing the distance of the camera to the plane rather
  than computing the plane's Z at the camera and comparing that with the camera's Z.

SVN r4220 (trunk)
This commit is contained in:
Randy Heit 2013-04-17 01:32:40 +00:00
commit a50e670c0c
6 changed files with 30 additions and 24 deletions
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22
src/r_utility.cpp
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@ -849,15 +849,17 @@ void R_SetupFrame (AActor *actor)
TArray<lightlist_t> &lightlist = viewsector->e->XFloor.lightlist;
if (lightlist.Size() > 0)
{
for(unsigned int i=0;i<lightlist.Size();i++)
for(unsigned int i = 0; i < lightlist.Size(); i++)
{
fixed_t lightbottom;
if (i<lightlist.Size()-1)
lightbottom = lightlist[i+1].plane.ZatPoint(viewx, viewy);
else
lightbottom = viewsector->floorplane.ZatPoint(viewx, viewy);
if (lightbottom < viewz)
secplane_t *plane;
int viewside;
plane = (i < lightlist.Size()-1) ? &lightlist[i+1].plane : &viewsector->floorplane;
viewside = plane->PointOnSide(viewx, viewy, viewz);
// Reverse the direction of the test if the plane was downward facing.
// We want to know if the view is above it, whatever its orientation may be.
if (plane->c < 0)
viewside = -viewside;
if (viewside > 0)
{
// 3d floor 'fog' is rendered as a blending value
PalEntry blendv = lightlist[i].blend;
@ -874,9 +876,9 @@ void R_SetupFrame (AActor *actor)
const sector_t *s = viewsector->GetHeightSec();
if (s != NULL)
{
newblend = viewz < s->floorplane.ZatPoint (viewx, viewy)
newblend = s->floorplane.PointOnSide(viewx, viewy, viewz) < 0
? s->bottommap
: viewz > s->ceilingplane.ZatPoint (viewx, viewy)
: s->ceilingplane.PointOnSide(viewx, viewy, viewz) < 0
? s->topmap
: s->midmap;
if (APART(newblend) == 0 && newblend >= numfakecmaps)