// 用ScreenPointToRay就可以了
public static void GetShootingRay(Camera camera, Vector3 mousePos, out Vector3 from, out Vector3 clickWorldPoint, out Vector3 normalDir)
{
if (camera.orthographic)
{
GeometryTool.GetGetShootingRayOrthographic(camera, mousePos, out from, out clickWorldPoint, out normalDir);
}
else
{
GeometryTool.GetShootingRayPerspective(camera, mousePos, out from, out clickWorldPoint, out normalDir);
}
}
public void hitBox(Ray ray_camera_space)
{
// camera to world
var ray = new Ray();
ray.origin = target_camera.transform.TransformPoint(ray_camera_space.origin);
ray.direction = target_camera.transform.TransformVector(ray_camera_space.direction);
// to local
ray.origin = transform.InverseTransformPoint(ray.origin);
ray.direction = transform.InverseTransformVector(ray.direction);
/*
* 雖然荷蘭兄已經有提供教學
* 但我還是想試試自己的方法
*
* group 0 : x+y+z=0
* https://www.geogebra.org/m/jmznkghr
*
* group 1 : x+y+z=1
* https://www.geogebra.org/m/h7nqemzh
*/
// 擊中 x+y+z=2的平面
Vector3 hit_pos;
var C = new Vector3(1.0f / 3, 1.0f / 3, 4.0f / 3);
var N = new Vector3(1, 1, 1).normalized;
var result = GeometryTool.RayHitPlane(ray.origin, ray.direction, N, C, out hit_pos);
// 分組:看看取floor之後落在 x+y+z=0 還是 x+y+z=1
var index = new Vector3(Mathf.Floor(hit_pos.x), Mathf.Floor(hit_pos.y), Mathf.Floor(hit_pos.z));
var group = index.x + index.y + index.z;
Debug.Log("group value:" + group + " ; " + index);
if (group == 0)
{
hit_cube.localPosition = index;
}
else
{
hit_cube.localPosition = index + getNearBoxOffset(ref hit_pos);
}
Debug.DrawLine(transform.TransformPoint(ray.origin), transform.TransformPoint(hit_pos));
}