How to set camera settings properly

volkerenderlein — Tue, 24 Jan 2023 07:41:46 GMT

In a FBX exporter from a Qt3d scene I try to copy the camera parameters to a FBX camera. First I create camera and camera node as follows:

auto lCamera = FbxCamera::Create(d->mFbxScene, "camera"); auto lCameraNode = FbxNode::Create(d->mFbxScene, "cameraNode"); lCameraNode->SetNodeAttribute(lCamera); auto lRootNode = d->mFbxScene->GetRootNode(); lRootNode->AddChild(lCameraNode); d->mFbxCamera = lCamera;

Then I try to copy the parameters from the QCamera object:

bool FbxExport::copyCameraSettings(Qt3DRender::QCamera* camera) { if (!camera || !d->mFbxManager) return false; auto position = camera->position(); auto viewCenter = camera->viewCenter(); auto upVector = camera->upVector().normalized(); FbxDouble3 lCameraLocation(position[0], position[1], position[2]); FbxDouble3 lNewPointOfInterest(viewCenter[0], viewCenter[1], viewCenter[2]); FbxDouble3 lUpVector(upVector[0], upVector[1], upVector[2]); auto lCamera = d->mFbxCamera; lCamera->ProjectionType.Set(camera->lens()->projectionType() == Qt3DRender::QCameraLens::PerspectiveProjection ? FbxCamera::ePerspective : FbxCamera::eOrthogonal); lCamera->Position.Set(lCameraLocation); lCamera->InterestPosition.Set(lNewPointOfInterest); lCamera->UpVector.Set(lUpVector); lCamera->SetNearPlane(camera->nearPlane()); lCamera->SetFarPlane(camera->farPlane()); lCamera->FieldOfView.Set(camera->fieldOfView()); lCamera->FocalLength.Set(lCamera->ComputeFocalLength(camera->fieldOfView())); lCamera->FocusSource.Set(FbxCamera::eFocusSpecificDistance); lCamera->FocusDistance.Set((viewCenter - position).length()); ... d->mFbxScene->GetGlobalSettings().SetDefaultCamera(lCamera->GetName()); }

But this does not seem to work as when opening the exported FBX in FBX Review I see the cameraNode selected but the camera settings not applied.

How should one copy the settings to be applicable in FBX Review?

Cheers, Volker

Re: How to set camera settings properly

volkerenderlein — Wed, 25 Jan 2023 07:31:44 GMT

I was under the impression that

lCamera->Position.Set(lCameraLocation);

should work. Setting the camera position using a camera nodes LcLTranslation property worked like a charm.

So out of curiosity what can the lCamera->Position property be used for other than positioning the camera?

topic How to set camera settings properly in FBX Forum

How to set camera settings properly

Re: How to set camera settings properly