Thank Apoch,
I followed your advice and went to work! Fixed it, now it works awesome here is the code.
So basically I compute all my potential intersection point Ts.
Then I test the potential itersection points on the Box collision mesh, discarding all point related to a negative T, because that would mean my Ray is colliding with a Box that is behind the character firing.
So here is the fixed code for my Ray Vs Box, thanks everyone.
Note that the collision test is different depending on the Rotation of the Box around the Y (up vector) Axis. Because, this code applies for Boxes that are Aligned with the Grid (where Y is the Up vector). Therefore, my box will only have two possible Rotations in the world 0.0f and 90.0f.
I use it for outside containers, crates, tables and walls in my game. Other objects use a Ray vs Sphere Collision test for now.
bool CWall3x3::FastProjectileCollisions( GLfloat x, GLfloat y, GLfloat z, GLfloat Rotx, GLfloat Roty )
{
if(m_Roty == 0.0f)
{
//COMPUTE Ts
GLfloat T0x = (m_x - 300.0f - x)/( -(float)sin(Roty*piover180) );
GLfloat T1x = (m_x + 300.0f - x)/( -(float)sin(Roty*piover180) );
GLfloat T0y = (m_y - 300.0f - y)/( -(float)sin(Rotx*piover180) );
GLfloat T1y = (m_y + 300.0f - y)/( -(float)sin(Rotx*piover180) );
GLfloat T0z = (m_z - 10.0f - z)/( -(float)cos(Roty*piover180) );
GLfloat T1z = (m_z + 10.0f - z)/( -(float)cos(Roty*piover180) );
//COMPUTE COLLISION COORDINATES
if(T0x > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T0x;
m_Cy = y - (float)sin(Rotx*piover180) * T0x;
m_Cz = z - (float)cos(Roty*piover180) * T0x;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 300.0f && m_Cx <= m_x + 300.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 10.0f && m_Cz <= m_z + 10.0f)
return true;
}
if(T1x > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T1x;
m_Cy = y - (float)sin(Rotx*piover180) * T1x;
m_Cz = z - (float)cos(Roty*piover180) * T1x;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 300.0f && m_Cx <= m_x + 300.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 10.0f && m_Cz <= m_z + 10.0f)
return true;
}
if(T0y > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T0y;
m_Cy = y - (float)sin(Rotx*piover180) * T0y;
m_Cz = z - (float)cos(Roty*piover180) * T0y;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 300.0f && m_Cx <= m_x + 300.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 10.0f && m_Cz <= m_z + 10.0f)
return true;
}
if(T1y > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T1y;
m_Cy = y - (float)sin(Rotx*piover180) * T1y;
m_Cz = z - (float)cos(Roty*piover180) * T1y;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 300.0f && m_Cx <= m_x + 300.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 10.0f && m_Cz <= m_z + 10.0f)
return true;
}
if(T0z > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T0z;
m_Cy = y - (float)sin(Rotx*piover180) * T0z;
m_Cz = z - (float)cos(Roty*piover180) * T0z;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 300.0f && m_Cx <= m_x + 300.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 10.0f && m_Cz <= m_z + 10.0f)
return true;
}
if(T1z > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T1z;
m_Cy = y - (float)sin(Rotx*piover180) * T1z;
m_Cz = z - (float)cos(Roty*piover180) * T1z;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 300.0f && m_Cx <= m_x + 300.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 10.0f && m_Cz <= m_z + 10.0f)
return true;
}
}
if(m_Roty == 90.0f)
{
//COMPUTE Ts
GLfloat T0x = (m_x - 10.0f - x)/( -(float)sin(Roty*piover180) );
GLfloat T1x = (m_x + 10.0f - x)/( -(float)sin(Roty*piover180) );
GLfloat T0y = (m_y - 300.0f - y)/( -(float)sin(Rotx*piover180) );
GLfloat T1y = (m_y + 300.0f - y)/( -(float)sin(Rotx*piover180) );
GLfloat T0z = (m_z - 300.0f - z)/( -(float)cos(Roty*piover180) );
GLfloat T1z = (m_z + 300.0f - z)/( -(float)cos(Roty*piover180) );
//COMPUTE COLLISION COORDINATES
if(T0x > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T0x;
m_Cy = y - (float)sin(Rotx*piover180) * T0x;
m_Cz = z - (float)cos(Roty*piover180) * T0x;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 10.0f && m_Cx <= m_x + 10.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 300.0f && m_Cz <= m_z + 300.0f)
return true;
}
if(T1x > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T1x;
m_Cy = y - (float)sin(Rotx*piover180) * T1x;
m_Cz = z - (float)cos(Roty*piover180) * T1x;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 10.0f && m_Cx <= m_x + 10.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 300.0f && m_Cz <= m_z + 300.0f)
return true;
}
if(T0y > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T0y;
m_Cy = y - (float)sin(Rotx*piover180) * T0y;
m_Cz = z - (float)cos(Roty*piover180) * T0y;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 10.0f && m_Cx <= m_x + 10.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 300.0f && m_Cz <= m_z + 300.0f)
return true;
}
if(T1y > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T1y;
m_Cy = y - (float)sin(Rotx*piover180) * T1y;
m_Cz = z - (float)cos(Roty*piover180) * T1y;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 10.0f && m_Cx <= m_x + 10.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 300.0f && m_Cz <= m_z + 300.0f)
return true;
}
if(T0z > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T0z;
m_Cy = y - (float)sin(Rotx*piover180) * T0z;
m_Cz = z - (float)cos(Roty*piover180) * T0z;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 10.0f && m_Cx <= m_x + 10.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 300.0f && m_Cz <= m_z + 300.0f)
return true;
}
if(T1z > 0)
{
m_Cx = x - (float)sin(Roty*piover180) * T1z;
m_Cy = y - (float)sin(Rotx*piover180) * T1z;
m_Cz = z - (float)cos(Roty*piover180) * T1z;
//RAY INTERSECTS RETURN TRUE
if(m_Cx >= m_x - 10.0f && m_Cx <= m_x + 10.0f && m_Cy >= m_y - 300.0f && m_Cy <= m_y + 300.0f && m_Cz >= m_z - 300.0f && m_Cz <= m_z + 300.0f)
return true;
}
}
return false;
}
