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-rwxr-xr-xjs/helper-classes/3D/StageLine.js13
1 files changed, 8 insertions, 5 deletions
diff --git a/js/helper-classes/3D/StageLine.js b/js/helper-classes/3D/StageLine.js
index 17021e91..38bd80ef 100755
--- a/js/helper-classes/3D/StageLine.js
+++ b/js/helper-classes/3D/StageLine.js
@@ -240,8 +240,9 @@ var StageLine = exports.StageLine = Object.create(Object.prototype, {
240 } 240 }
241 241
242 // boundary points (line points: lPt0, lPt1) 242 // boundary points (line points: lPt0, lPt1)
243 var bPt0, bPt1, bPt2, bVec, bVec0, bVec1, lVec; 243 var bPt0, bPt1, bPt2, bVec, bVec0, bVec1, lVec, d;
244 244
245 var planeEq = plane.getPlaneEq();
245 if (MathUtils.fpSign(t) == 0) 246 if (MathUtils.fpSign(t) == 0)
246 { 247 {
247 // get the 3 relevant points. The line goes through pt1. 248 // get the 3 relevant points. The line goes through pt1.
@@ -260,6 +261,9 @@ var StageLine = exports.StageLine = Object.create(Object.prototype, {
260 rtnVal = true; 261 rtnVal = true;
261 else if (plane.isBackFacing() && (MathUtils.fpSign(c0) > 0) && (MathUtils.fpSign(c1) > 0)) 262 else if (plane.isBackFacing() && (MathUtils.fpSign(c0) > 0) && (MathUtils.fpSign(c1) > 0))
262 rtnVal = true; 263 rtnVal = true;
264
265 d = vecUtils.vecDot(3, lPt1, planeEq) + planeEq[3];
266 if (rtnVal && (MathUtils.fpSign(d) > 0)) rtnVal = false;
263 } 267 }
264 else 268 else
265 { 269 {
@@ -268,13 +272,12 @@ var StageLine = exports.StageLine = Object.create(Object.prototype, {
268 bVec = vecUtils.vecSubtract(3, bPt1, bPt0); 272 bVec = vecUtils.vecSubtract(3, bPt1, bPt0);
269 lVec = vecUtils.vecSubtract(3, lPt1, lPt0); 273 lVec = vecUtils.vecSubtract(3, lPt1, lPt0);
270 274
271 var planeEq = plane.getPlaneEq(); 275 var backFacing = plane.isBackFacing();
272 var bNormal = vecUtils.vecCross(3, planeEq, bVec); 276 var bNormal = vecUtils.vecCross(3, planeEq, bVec);
273 var dot = vecUtils.vecDot(3, bNormal, lVec); 277 var dot = vecUtils.vecDot(3, bNormal, lVec);
274 if (MathUtils.fpSign(dot) < 0) 278 if ((!backFacing && (MathUtils.fpSign(dot) < 0)) || (backFacing && (MathUtils.fpSign(dot) > 0)))
275 { 279 {
276 var d = vecUtils.vecDot(3, lPt1, planeEq) + planeEq[3]; 280 d = vecUtils.vecDot(3, lPt1, planeEq) + planeEq[3];
277 if (plane.isBackFacing()) d = -d;
278 if (MathUtils.fpSign(d) < 0) rtnVal = true; 281 if (MathUtils.fpSign(d) < 0) rtnVal = true;
279 } 282 }
280 } 283 }