GameIntersection Class

The following example shows how you can get the intersection point (vec3) of the cylinder between two points with an obstacle. In this example the cylinder is an invisible traced cylinder from the point of the camera (vec3 p0) to the point of the mouse pointer (vec3 p1) with the specific radius. The executing sequence is the following:

• Define and initialize two points (p0 and p1) by using the Unigine::getPlayerMouseDirection() function from core/scripts/utils.h.
• Create an instance of the GameIntersection class to get the intersection point coordinates.
• Check, if there is a intersection with an obstacle. The engine.game.getIntersection() function returns an intersected obstacle when the obstacle appears in the area of the cylinder.
• After that GameIntersection instance gets the point of the nearest intersection point and you can get it by using the getPoint() function.

#include <core/scripts/utils.h>
/* ... */
// define two vec3 coordinates
vec3 p0,p1;
// get the mouse direction from camera (p0) to cursor pointer (p1)
Unigine::getPlayerMouseDirection(p0,p1);

// create an instance of the GameIntersection class
GameIntersection intersection = new GameIntersection();
 
// try to get the intersection with an obstacle.
// cylinder has radius 0.1f, intersection mask equals to 1
Obstacle obstacle = engine.game.getIntersection(p0,p1,0.1f, 1, intersection);

// check, if the intersection of mouse direction with any obstacle was occurred;
if(obstacle !=NULL)
{
  // show the coordinates of the intersection in console 
  log.message("The intersection with obstacle was here: %s\n", typeinfo(intersection.getPoint()));
}
/* ... */