How to Position the 3D Rendering Viewport (not using "BasicScene")

Question

Hi,
I wrote a custom scene manager which directly manipulating the scenegraph (Instance3D) - I just need some more direct access to it. The 3D view is part of a bigger sourrounding AIR/Flex-based Application, which displays some graphics using convential displaylist. Now I would need to position the 3D rendering area at certain coordinates in relation to the outer main applicaiton window (stage) and application state.
I was able to replicate most of the internals of "BasicScene" based on the example "Tutorial05_SpriteBased", but I am struggled on how to positioning the 3D rendering area managed by proscenium:
- BasicScene exposes a "viewport" property that takes a reference to a DisplayObject. It seems like it internally adjusts dimension and position of the stage3D-based rendering area based on that "viewport" x,y,width, and height.
- I did figure out how to set dimensions of the area (sg is the Instance3D reference):
                              sg.configureBackBuffer(viewPort.width, viewPort.height, 2, true );
                              sg.scene.activeCamera.aspect = viewPort.width / viewPort.height;
- I could not find any way to define a x/y position.
Any help would be greatly appreciated - probably its just a small thing, but I do not have the source from BasicScene - otherwise I could look it up myself.
THanks,
Philipp

Answer 1

Figured this out how to set the viewport. The Camera exposes a method "setViewport". There is a Demo "TestViewport". The calculation for the viewports top, left, bottom, right values gets more complicated in my case because I have stage scale mode set to StageScaleMode.SHOW_ALL.
sg.configureBackBuffer(viewPort.stage.fullScreenWidth, viewPort.stage.fullScreenHeight, 2, true );
sg.scene.activeCamera.aspect = viewPort.stage.fullScreenWidth / viewPort.stage.fullScreenHeight;
sg.scene.activeCamera.setViewport(true, -0.5, 0.5, -0.5, 0.5 );