Using Open Reality SDK, the class HFBCamera members Near and Far are not Animatable even the UI allow to Animate them

[aguyet]

Hello,

My names is Alain Guyet, CTO at Asobo Studio France, working a AAA titles as MSFS 2020 and The Plague Tale.

I want to export Near & Far HFBCamera members, this work, but i can't find a way to export them if they are animated.

In the header there's a back comp comment (inserted below), and i didn't succeed to retrieve animated Near&Far Node and Curve.

////////////////WARNING////////////////////////////////////
BACK-COMP implementation:
The proper implementation is to change UseDepthOfField from
FBPropertyBool to FBPropertyAnimatableBool. This breaks
backward compatibility and should only be done for major releases
////////////////WARNING////////////////////////////////////

void GetAnimatableFarPlane(FBPropertyAnimatableDouble *pProp);
void GetAnimatableNearPlane(FBPropertyAnimatableDouble *pProp);

So, i try to use this (code below), to find the FBPropertyFCurve that should contain all keyframed Near or Far values, but the GetAnimatedNode is null.

   FBPropertyAnimatableDouble nearPlaneAnimatable;
   pCamera->GetAnimatableFarPlane(&nearPlaneAnimatable);

   if(nearPlaneAnimatable.GetAnimationNode()!=NULL)
   {
        FBPropertyFCurve &curve=nearPlaneAnimatable.GetAnimationNode()->FCurve;

  }

So could you help me ? Maybe there's another way i didn't find, i think the SDK didn't match the MotionBuilder 2019, so if it's the case a code sample will be appreciated.

Thanks a lot!

[Mocappy]

Hello Alain,

Not sure if I've understood you correctly, but in python you can use something like this to get the 'frame' and 'value' of a keyframe on the Near Plane property of a camera...

from pyfbsdk import*

camera_obj = FBFindModelByLabelName("Camera")

cam_near_plane_anim_node = camera_obj.AnimatableNearPlane.GetAnimationNode()

if cam_near_plane_anim_node:
    for curve_key in cam_near_plane_anim_node.FCurve.Keys:
        frame = FBTime.GetFrame(curve_key.Time, FBPlayerControl().GetTransportFps())
        value = curve_key.Value
        print "Camera Near Plane has value {} on frame {}".format(value, frame)
else:
    print "Camera Near Plane is not animated"

Hope this helps,

[aguyet]

Hello and sorry if my message wasn't enough clear.

Thanks for the phyton sample, it work fine.

But i don't use python to export , i use the C++ SDK, since a while now and i don't want to migrate to phyton.

So using the OpenReality SDK, the C++ FBCamera class didn't expose the animatable property for Near and Far, check below the class provided by the SDK.  

class FBSDK_DLL FBCamera : public FBModel {
__FBClassDeclare( FBCamera,FBModel );
public:
....
FBPropertyDouble NearPlaneDistance; //!< <b>Read Write Property:</b> Near plane distance.
FBPropertyDouble FarPlaneDistance; //!< <b>Read Write Property:</b> Far plane distance.
...

/*
////////////////WARNING////////////////////////////////////
BACK-COMP implementation:
The proper implementation is to change UseDepthOfField from
FBPropertyBool to FBPropertyAnimatableBool. This breaks
backward compatibility and should only be done for major releases
////////////////WARNING////////////////////////////////////
*/
void GetAnimatableFarPlane(FBPropertyAnimatableDouble *pProp);
void GetAnimatableNearPlane(FBPropertyAnimatableDouble *pProp);
};

I try using the GetAnimatableNearPlane(FBPropertyAnimatableDouble *pProp) that seem to be a workaround, but it didn't work.

Could you transfer my problem to someone who knows the c++ sdk, i believe the phyton is more up to date.

Thanks.