Firing from cross hair towards the forward direction

Medo Mex · 2013-01-06T00:10:27

I'm trying to allow the player to fire from their weapons, what I'm doing is that I will cast a ray from the middle of the screen to a forward direction, so I will have a method like void fire(float distance) doing the following; D3DXVECTOR3 rayFrom = ScreenToWorld(); // rayFrom = Cross hair position, middle of the screen position in 3D D3DXVECTOR3 rayTo = ???; How do I set rayTo? it should be FORWARD since the cross hair always shoot forward, I want to set the value of rayTo while taking care of the parameter float distance so I can allow the player to fire and limit the distance.

Graphics and GPU Programming Programming

Started by Medo Mex January 05, 2013 09:18 PM

9 comments, last by Medo Mex 11 years, 3 months ago

Medo Mex

891

Author

January 06, 2013 12:10 AM

Okay, I tried the following but can't get it to work yet:


float distance = 1000.0f;
D3DXVECTOR3 rayFrom = camera->GetPosition();
D3DXVECTOR3 rayTo = ScreenToWorld(hWnd, WINDOW_WIDTH/2, WINDOW_HEIGHT/2, camera->viewMatrix(), camera->projectionMatrix());
D3DXVECTOR3 direction;
D3DXVec3Normalize(&direction, &(rayTo - rayFrom));
D3DXVec3Scale(&direction, &direction, distance);
Raycasting(rayFrom, direction);