Fix roof bug

data

@@ -140,5 +140,6 @@ details
 #RLCtiny2 00'05'181;00LCtiny2;833ee4b2 0000157:0011:0320:0034:00a0:00d4:00f0
 #RLCtiny3 00'11'880;00LCtiny3;df0bd8ce 0000360:0001:00c3:0031:00d3:0031:00e9:0031:00e9:0041:0069:0021:0059:0021:00c3:0041:0233:0041:0159:0251:0113:0031:01a3:0031:0143:0021:00a9:0021:00d3:0041:0253:0031:00a3:0041
 #RLCtiny4 00'05'280;00LCtiny4;f999f0ec 0000160:0003:01d1:0019:01f1:0119:0061:0109:0041:0209:0041
+#RLCtiny5 00'08'811;00LCtiny5;5c14d8b6 0000267:0001:00f9:0041:0139:00b1:0109:0041:0049:0021:0103:0151:0083:0061:0069:0081:0093:0031:0083:00d1:0083:0031:0143:0021:0175:0021:0109:0031
 #RLCbonus1 00'14'256;00LCbonus1;999b1acd 0000432:0001:0129:0051:0059:0011:00d3:0021:0169:0081:0013:0121:0049:0051:0033:0031:0093:0091:00c9:01f1:00c9:0061:0153:0031:0189:00c1:00e9:0021:01d9:0031:0159:0028:0020:0014:003c:0014:0020:0028:0059:0061:0079:0021:0049:00a1:0089:0041:0029:0031:0089:0011:0079:0068:0020:0038:0020:0028:0099:0041:0083
 #RLCbonus2 00'26'103;00LCbonus2;288d28fe 0000791:0001:0163:0101:0053:0021:00c3:0071:0063:0031:0059:00b8:0050:0034:0016:00f4:003c:00a4:00a6:0044:0056:0024:00a6:0112:0020:0029:0071:00d9:0031:0053:0091:0113:0061:00b5:0049:0101:00a3:00c2:0083:0101:0029:0051:0183:0041:0063:0041:00c3:0041:0119:0051:0019:0041:0055:0049:0018:0099:0031:0052:0023:0022:0023:0052:0073:0041:0070:0032:0046:00e4:0010:0038:0069:00a8:0139:0078:0079:00ac:0014:006c:0078:0010:0061:0079:00a1:0063:0031:0133:0031:0030:0058:002c:0018:0190:0022:0026:0030:0062:0010:0028:0029:0121:0043:0062:0020:0042:0053:00b1:0175:004c:0018:0080:0061:0033:0031:0022:0093:0011:0020:0018:0069

racing.h

@@ -39,6 +39,15 @@
     will stop being compatible. It's still possible to make other changes to
     this module (such as optimizations or comments) without having to change
     physics version.
+  - The physics car body has joints numbered like this:
+
+        front
+    l (2)---(3) r
+    e  |\   /|  i
+    f  | (4) |  g
+    t  |/   \|  h
+      (0)---(1) t
+         rear
 */
 
 typedef int32_t LCR_GameUnit;        ///< abstract game unit
@@ -1147,6 +1156,22 @@ int _LCR_racingCarShapeOK(void)
   TPE_Unit bodyTension = 0;
   TPE_Connection *c = LCR_racing.carConnections;
 
+  if (TPE_vec3Dot( // checks if roof is on the correct side (can be pushed down)
+        TPE_vec3Minus(
+          LCR_racing.carBody.joints[4].position,
+          LCR_racing.carBody.joints[0].position),
+        TPE_vec3Cross(
+          TPE_vec3Minus(
+            LCR_racing.carBody.joints[0].position,
+            LCR_racing.carBody.joints[2].position),
+          TPE_vec3Minus(
+            LCR_racing.carBody.joints[0].position,
+            LCR_racing.carBody.joints[1].position))) <= 0)
+  {
+    LCR_LOG1("roof flipped over");
+    return 0;
+  }
+
   for (int i = 0; i < LCR_CAR_CONNECTIONS; ++i) // joint tension
   {
     bodyTension += TPE_abs(