Merge pull request #140 from thorlucas/master

Added raycast case for integer positions

util/voxel_raycast.h

@@ -75,6 +75,28 @@ bool voxel_raycast(
 	} else
 		tcross_z = g_infinite; // Will never cross on X
 
+	// Workaround for integer positions
+	// Adapted from https://github.com/bulletphysics/bullet3/blob/3dbe5426bf7387e532c17df9a1c5e5a4972c298a/src/BulletCollision/CollisionShapes/btHeightfieldTerrainShape.cpp#L418
+	if (tcross_x == 0.0) {
+		tcross_x += tdelta_x;
+		// If going backwards, we should ignore the position we would get by the above flooring,
+		// because the ray is not heading in that direction
+		if (xi_step == -1)
+			hit_pos.x -= 1;
+	}
+
+	if (tcross_y == 0.0) {
+		tcross_y += tdelta_y;
+		if (yi_step == -1)
+			hit_pos.y -= 1;
+	}
+
+	if (tcross_z == 0.0) {
+		tcross_z += tdelta_z;
+		if (zi_step == -1)
+			hit_pos.z -= 1;
+	}
+
 	/* Iteration */
 
 	do {