fix walking boundary of 3D test in lua

cocos/scripting/lua-bindings/manual/3d/lua_cocos2dx_3d_manual.cpp

@@ -468,6 +468,67 @@ int lua_cocos2dx_3d_Terrain_getHeight(lua_State* L)
     return 0;
 }
 
+int lua_cocos2dx_3d_Terrain_getIntersectionPoint(lua_State* tolua_S)
+{
+    int argc = 0;
+    cocos2d::Terrain* cobj = nullptr;
+    bool ok = true;
+#if COCOS2D_DEBUG >= 1
+    tolua_Error tolua_err;
+#endif
+
+#if COCOS2D_DEBUG >= 1
+    if (!tolua_isusertype(tolua_S, 1, "cc.Terrain", 0, &tolua_err)) goto tolua_lerror;
+#endif
+    cobj = (cocos2d::Terrain*)tolua_tousertype(tolua_S, 1, 0);
+#if COCOS2D_DEBUG >= 1
+    if (!cobj)
+    {
+        tolua_error(tolua_S, "invalid 'cobj' in function 'lua_cocos2dx_3d_Terrain_getIntersectionPoint'", nullptr);
+        return 0;
+    }
+#endif
+    argc = lua_gettop(tolua_S) - 1;
+    do {
+        if (argc == 2) {
+            cocos2d::Ray* arg0 = nullptr;
+            ok &= luaval_to_object<cocos2d::Ray>(tolua_S, 2, "cc.Ray", &arg0, "cc.Terrain:getIntersectionPoint");
+
+            if (!ok) { break; }
+            cocos2d::Vec3 arg1;
+            ok &= luaval_to_vec3(tolua_S, 3, &arg1, "cc.Terrain:getIntersectionPoint");
+
+            if (!ok) { break; }
+            bool ret = cobj->getIntersectionPoint(*arg0, arg1);
+            tolua_pushboolean(tolua_S, (bool)ret);
+            vec3_to_luaval(tolua_S, arg1);
+            return 2;
+        }
+    } while (0);
+    ok = true;
+    do {
+        if (argc == 1) {
+            cocos2d::Ray* arg0;
+            ok &= luaval_to_object<cocos2d::Ray>(tolua_S, 2, "cc.Ray", &arg0, "cc.Terrain:getIntersectionPoint");
+
+            if (!ok) { break; }
+            cocos2d::Vec3 ret = cobj->getIntersectionPoint(*arg0);
+            vec3_to_luaval(tolua_S, ret);
+            return 1;
+        }
+    } while (0);
+    ok = true;
+    luaL_error(tolua_S, "%s has wrong number of arguments: %d, was expecting %d \n", "cc.Terrain:getIntersectionPoint", argc, 1);
+    return 0;
+
+#if COCOS2D_DEBUG >= 1
+    tolua_lerror:
+                tolua_error(tolua_S, "#ferror in function 'lua_cocos2dx_3d_Terrain_getIntersectionPoint'.", &tolua_err);
+#endif
+
+ return 0;
+}
+
 static void extendTerrain(lua_State* L)
 {
     lua_pushstring(L, "cc.Terrain");
@@ -476,6 +537,7 @@ static void extendTerrain(lua_State* L)
     {
         tolua_function(L, "create", lua_cocos2dx_3d_Terrain_create);
         tolua_function(L, "getHeight", lua_cocos2dx_3d_Terrain_getHeight);
+        tolua_function(L, "getIntersectionPoint", lua_cocos2dx_3d_Terrain_getIntersectionPoint);
     }
     lua_pop(L, 1);
 }

tests/lua-tests/src/Camera3DTest/Camera3DTest.lua

@@ -236,6 +236,11 @@ function Camera3DTestDemo:onEnter()
                 local ndo = nearP.x * 0 + nearP.y * 1 + nearP.z * 0
                 dist= (0 - ndo) / ndd
                 local p =   cc.vec3add(nearP, cc.vec3mul(dir, dist))
+
+                if p.x >  100 then p.x =  100 end
+                if p.x < -100 then p.x = -100 end
+                if p.z >  100 then p.z =  100 end
+                if p.z < -100 then p.z = -100 end
                 self._targetPos = p
             end
         end

tests/lua-tests/src/Scene3DTest/Scene3DTest.lua

@@ -181,34 +181,16 @@ function TerrainWalkThru:init()
                 local dir = cc.vec3sub(farP, nearP)
                 dir = cc.vec3normalize(dir)
 
-                local rayStep = cc.vec3mul(dir, 15)
-                local rayPos =  nearP
-                local rayStartPosition = nearP
-                local lastRayPosition  = rayPos
-                rayPos = cc.vec3add(rayPos, rayStep)
-                -- Linear search - Loop until find a point inside and outside the terrain Vector3 
-                local height = self._terrain:getHeight(rayPos.x, rayPos.z)
-
-                while rayPos.y > height do
-                    lastRayPosition = rayPos 
-                    rayPos = cc.vec3add(rayPos, rayStep)
-                    height = self._terrain:getHeight(rayPos.x,rayPos.z) 
+                local collisionPoint = cc.vec3(-999,-999,-999)
+                local ray =  cc.Ray:new(nearP, dir)
+                local isInTerrain = true;
+                isInTerrain, collisionPoint = self._terrain:getIntersectionPoint(ray, collisionPoint)
+
+                if( not isInTerrain) then  
+                    self._player:idle()
+                    return
                 end
 
-                local startPosition = lastRayPosition
-                local endPosition   = rayPos
-
-                for i = 1, 32 do
-                    -- Binary search pass 
-                    local middlePoint = cc.vec3mul(cc.vec3add(startPosition, endPosition), 0.5)
-                    if (middlePoint.y < height) then
-                        endPosition = middlePoint 
-                    else 
-                        startPosition = middlePoint
-                    end
-                end
-
-                local collisionPoint = cc.vec3mul(cc.vec3add(startPosition, endPosition), 0.5)
                 local playerPos = self._player:getPosition3D()
                 dir = cc.vec3sub(collisionPoint, playerPos)
                 dir.y = 0
@@ -217,7 +199,6 @@ function TerrainWalkThru:init()
 
                 self._player._headingAxis = vec3_cross(dir, cc.vec3(0, 0, -1), self._player._headingAxis)
                 self._player._targetPos = collisionPoint
-                -- self._player:forward()
                 self._player._playerState = PLAER_STATE.FORWARD
             end
         end