Frustum Camera::GetSplitFrustum(float nearClip, float farClip) const
{
if (projectionDirty_)
UpdateProjection();
nearClip = Max(nearClip, projNearClip_);
farClip = Min(farClip, projFarClip_);
if (farClip < nearClip)
farClip = nearClip;
Frustum ret;
if (customProjection_)
{
// DefineSplit() needs to project the near & far distances, so can not use a combined view-projection matrix.
// Transform to world space afterward instead
ret.DefineSplit(projection_, nearClip, farClip);
ret.Transform(GetEffectiveWorldTransform());
}
else
{
if (!orthographic_)
ret.Define(fov_, aspectRatio_, zoom_, nearClip, farClip, GetEffectiveWorldTransform());
else
ret.DefineOrtho(orthoSize_, aspectRatio_, zoom_, nearClip, farClip, GetEffectiveWorldTransform());
}
return ret;
}
const Matrix3x4& Camera::GetView() const
{
if (viewDirty_)
{
// Note: view matrix is unaffected by node or parent scale
view_ = GetEffectiveWorldTransform().Inverse();
viewDirty_ = false;
}
return view_;
}
const Frustum& Camera::GetFrustum() const
{
if (frustumDirty_)
{
Matrix3x4 worldTransform = GetEffectiveWorldTransform();
if (!orthographic_)
frustum_.Define(fov_, aspectRatio_, zoom_, GetNearClip(), farClip_, worldTransform);
else
frustum_.DefineOrtho(orthoSize_, aspectRatio_, zoom_, GetNearClip(), farClip_, worldTransform);
frustumDirty_ = false;
}
return frustum_;
}
Frustum Camera::GetSplitFrustum(float nearClip, float farClip) const
{
Frustum ret;
Matrix3x4 worldTransform = GetEffectiveWorldTransform();
nearClip = Max(nearClip, GetNearClip());
farClip = Min(farClip, farClip_);
if (farClip < nearClip)
farClip = nearClip;
if (!orthographic_)
ret.Define(fov_, aspectRatio_, zoom_, nearClip, farClip, worldTransform);
else
ret.DefineOrtho(orthoSize_, aspectRatio_, zoom_, nearClip, farClip, worldTransform);
return ret;
}
const Frustum& Camera::GetFrustum() const
{
// Use projection_ instead of GetProjection() so that Y-flip has no effect. Update first if necessary
if (projectionDirty_)
UpdateProjection();
if (frustumDirty_)
{
if (customProjection_)
frustum_.Define(projection_ * GetView());
else
{
// If not using a custom projection, prefer calculating frustum from projection parameters instead of matrix
// for better accuracy
if (!orthographic_)
frustum_.Define(fov_, aspectRatio_, zoom_, GetNearClip(), GetFarClip(), GetEffectiveWorldTransform());
else
frustum_.DefineOrtho(orthoSize_, aspectRatio_, zoom_, GetNearClip(), GetFarClip(), GetEffectiveWorldTransform());
}
frustumDirty_ = false;
}
return frustum_;
}
