Author: ArcRiley
Date: 2008-07-15 01:40:39 -0400 (Tue, 15 Jul 2008)
New Revision: 1310
Modified:
trunk/pysoy/src/scenes/Landscape.pym
Log:
Ticket #929 :
* cleaned up face generation loop
* fixed winding order
Modified: trunk/pysoy/src/scenes/Landscape.pym
===================================================================
--- trunk/pysoy/src/scenes/Landscape.pym 2008-07-15 05:15:40 UTC (rev
1309)
+++ trunk/pysoy/src/scenes/Landscape.pym 2008-07-15 05:40:39 UTC (rev
1310)
@@ -88,6 +88,7 @@
cdef void _createArrays(self) :
cdef int _i, _j, _currentLoop
cdef double _x, _y, _z
+ cdef unsigned short _a, _b, _c, _d
# set up the vert array
for _i from 0 <= _i < self._heightmapTex._height :
for _j from 0 <= _j < self._heightmapTex._width :
@@ -117,16 +118,28 @@
#loop through all of the quads in the grid
for _i from 0 <= _i < self._heightmapTex._height-1 :
for _j from 0 <= _j < self._heightmapTex._width-1 :
+ #
+ # for code cleanlyness, get the four verticies first as:
+ #
+ # a-d Note CCW winding order.
+ # |\| Tri 1 = abc
+ # b-c Tri 2 = acd
+ #
+ _a = _j + ( _i * self._heightmapTex._width)
+ _b = _j + ((_i+1) * self._heightmapTex._width)
+ _c = _j + ((_i+1) * self._heightmapTex._width) + 1
+ _d = _j + ( _i * self._heightmapTex._width) + 1
+ #
#create the upper left tri in the quad
#verts are in counter clockwise direction
- self._elementArray[_currentLoop].a = _j + 1 + _i *
self._heightmapTex._width
- self._elementArray[_currentLoop].b = _j + _i *
self._heightmapTex._width
- self._elementArray[_currentLoop].c = _j + (_i+1) *
self._heightmapTex._width
+ self._elementArray[_currentLoop].a = _a
+ self._elementArray[_currentLoop].b = _b
+ self._elementArray[_currentLoop].c = _c
_currentLoop += 1
#now the bottom right!
- self._elementArray[_currentLoop].a = _j + 1 + _i *
self._heightmapTex._width
- self._elementArray[_currentLoop].b = _j + (_i+1) *
self._heightmapTex._width
- self._elementArray[_currentLoop].c = _j + 1 + (_i+1) *
self._heightmapTex._width
+ self._elementArray[_currentLoop].a = _a
+ self._elementArray[_currentLoop].b = _c
+ self._elementArray[_currentLoop].c = _d
_currentLoop += 1
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