From 2aa2097b6cffd6ed58e127b0ed4f76d6255ac495 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Tue, 5 Jan 2010 22:29:21 +0100
Subject: New and improved edge collision handling! Get it while it's hot!

---
 src/Game.cpp | 40 +++++++++++++++-------------------------
 1 file changed, 15 insertions(+), 25 deletions(-)

(limited to 'src/Game.cpp')

diff --git a/src/Game.cpp b/src/Game.cpp
index aea829f..d13a262 100644
--- a/src/Game.cpp
+++ b/src/Game.cpp
@@ -136,43 +136,32 @@ void Game::run(int delta) {
   while(collision) {
     collision = false;
 
-    MathUtil::Plane nearestPlane;
     float nearestDistance;
+    vmml::vec3f nearestNormal;
 
     for(std::vector<TriangleRecord>::iterator t = triangles.begin(); t != triangles.end(); ++t) {
-      if(Collision::test(t->getTriangle(), playerPos, PLAYER_RADIUS, playerMove)) {
-        vmml::vec3f normal = t->getTriangle().computeNormal();
+      float distance;
+      vmml::vec3f normal;
+
+      if(Collision::test(t->getTriangle(), playerPos, PLAYER_RADIUS, playerMove, &distance, &normal)) {
+        normal.y() = 0;
+
         if(normal.dot(playerMove) >= 0)
           continue;
 
-        MathUtil::Plane p(normal, vmml::dot(normal, t->getTriangle().getVertex(0)+PLAYER_RADIUS*normal));
-        if(p.isInFront(playerPos) || p.contains(playerPos)) {
-          vmml::vec3f intersection = p.intersection(MathUtil::Ray(playerPos, playerMove));
-          float distance = intersection.squared_distance(playerPos);
-
-          if(!collision || distance < nearestDistance) {
-            collision = true;
-
-            nearestPlane = p;
-            nearestDistance = distance;
-          }
-        }
-        else {
-          // TODO Edge collision
+        if(!collision || distance < nearestDistance) {
+          collision = true;
 
+          nearestDistance = distance;
+          nearestNormal = normal;
         }
       }
     }
 
     if(collision) {
-      vmml::vec3f move;
-
-      if(playerMove.dot(nearestPlane.getNormal()) == 0)
-        move = playerMove;
-      else
-        move = nearestPlane.intersection(MathUtil::Ray(playerPos, playerMove)) - playerPos;
+      vmml::vec3f move = playerMove*nearestDistance;
 
-      if(move.dot(origMove) <= 0 && move.squared_length() > MathUtil::EPSILON) {
+      if(move.dot(origMove) <= 0 && move.squared_length() > 0) {
         return;
       }
 
@@ -182,7 +171,8 @@ void Game::run(int delta) {
       playerPos += move;
 
       vmml::vec3f restMove = playerMove - move;
-      playerMove = restMove - nearestPlane.getNormal() * (nearestPlane.getNormal().dot(restMove));
+
+      playerMove = restMove - nearestNormal * (nearestNormal.dot(restMove));
     }
   }
 
-- 
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