Fix float precision issues in bulletHeightfieldShape

Closes: #152

panda/src/bullet/bulletHeightfieldShape.I

@@ -30,8 +30,8 @@ BulletHeightfieldShape(const BulletHeightfieldShape &copy) :
   _num_rows(copy._num_rows),
   _num_cols(copy._num_cols) {
 
-  _data = new float[_num_rows * _num_cols];
-  memcpy(_data, copy._data, _num_rows * _num_cols * sizeof(float));
+  _data = new btScalar[_num_rows * _num_cols];
+  memcpy(_data, copy._data, _num_rows * _num_cols * sizeof(btScalar));
 }
 
 /**
@@ -44,6 +44,6 @@ operator = (const BulletHeightfieldShape &copy) {
   _num_rows = copy._num_rows;
   _num_cols = copy._num_cols;
 
-  _data = new float[_num_rows * _num_cols];
-  memcpy(_data, copy._data, _num_rows * _num_cols * sizeof(float));
+  _data = new btScalar[_num_rows * _num_cols];
+  memcpy(_data, copy._data, _num_rows * _num_cols * sizeof(btScalar));
 }

panda/src/bullet/bulletHeightfieldShape.cxx

@@ -26,7 +26,7 @@ BulletHeightfieldShape(const PNMImage &image, PN_stdfloat max_height, BulletUpAx
   _num_rows = image.get_x_size();
   _num_cols = image.get_y_size();
 
-  _data = new float[_num_rows * _num_cols];
+  _data = new btScalar[_num_rows * _num_cols];
 
   for (int row=0; row < _num_rows; row++) {
     for (int column=0; column < _num_cols; column++) {
@@ -75,10 +75,10 @@ BulletHeightfieldShape(Texture *tex, PN_stdfloat max_height, BulletUpAxis up) {
 
   _num_rows = tex->get_x_size() + 1;
   _num_cols = tex->get_y_size() + 1;
-  _data = new float[_num_rows * _num_cols];
+  _data = new btScalar[_num_rows * _num_cols];
 
-  PN_stdfloat step_x = 1.0 / (PN_stdfloat)tex->get_x_size();
-  PN_stdfloat step_y = 1.0 / (PN_stdfloat)tex->get_y_size();
+  btScalar step_x = 1.0 / (btScalar)tex->get_x_size();
+  btScalar step_y = 1.0 / (btScalar)tex->get_y_size();
 
   PT(TexturePeeker) peeker = tex->peek();
   LColor sample;
@@ -100,4 +100,4 @@ BulletHeightfieldShape(Texture *tex, PN_stdfloat max_height, BulletUpAxis up) {
                                          up,
                                          true, false);
   _shape->setUserPointer(this);
-}
+}

panda/src/bullet/bulletHeightfieldShape.h

@@ -44,7 +44,7 @@ public:
 private:
   int _num_rows;
   int _num_cols;
-  float *_data;
+  btScalar *_data;
   btHeightfieldTerrainShape *_shape;
 
 public: