float Camera::GetDistance(const Vector3& worldPos) const
{
if (!orthographic_)
{
const Vector3& cameraPos = node_ ? node_->GetWorldPosition() : Vector3::ZERO;
return (worldPos - cameraPos).Length();
}
else
return Abs((GetInverseWorldTransform() * worldPos).z_);
}
float Camera::GetDistanceSquared(const Vector3& worldPos) const
{
if (!orthographic_)
{
const Vector3& cameraPos = node_ ? node_->GetWorldPosition() : Vector3::ZERO;
return (worldPos - cameraPos).LengthSquared();
}
else
{
float distance = (GetInverseWorldTransform() * worldPos).z_;
return distance * distance;
}
}
Ray Camera::GetScreenRay(float x, float y)
{
Ray ret;
// If projection is invalid, just return a ray pointing forward
if (!IsProjectionValid())
{
ret.origin_ = node_ ? node_->GetWorldPosition() : Vector3::ZERO;
ret.direction_ = GetForwardVector();
return ret;
}
Matrix4 viewProjInverse = (GetProjection(false) * GetInverseWorldTransform()).Inverse();
// The parameters range from 0.0 to 1.0. Expand to normalized device coordinates (-1.0 to 1.0) & flip Y axis
x = 2.0f * x - 1.0f;
y = 1.0f - 2.0f * y;
Vector3 near(x, y, 0.0f);
Vector3 far(x, y, 1.0f);
ret.origin_ = viewProjInverse * near;
ret.direction_ = ((viewProjInverse * far) - ret.origin_).Normalized();
return ret;
}
bool Zone::IsInside(const Vector3& point) const
{
// Use an oriented bounding box test
Vector3 localPoint(GetInverseWorldTransform() * point);
return boundingBox_.IsInside(localPoint) != OUTSIDE;
}