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Canvas FAQs: Difference between revisions
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→Canvas vs. Tail/Scene Cams
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If we don't do that, we will continue to see cool Canvas features implemented as spaghetti code monsters that reflect badly upon Nasal and Canvas due to lack of of design, and performance.<ref>{{cite web | If we don't do that, we will continue to see cool Canvas features implemented as spaghetti code monsters that reflect badly upon Nasal and Canvas due to lack of of design, and performance.<ref>{{cite web | ||
|url = https://forum.flightgear.org/viewtopic.php?p=260810#p260810 | |url = https://forum.flightgear.org/viewtopic.php?p=260810#p260810 | ||
|title = <nowiki> Re: WINDOW IN WINDOW </nowiki> | |||
|author = <nowiki> Hooray </nowiki> | |||
|date = Oct 17th, 2015 | |||
|added = Oct 17th, 2015 | |||
|script_version = 0.40 | |||
}}</ref> | |||
tail cams are slaved cameras, so could be using code that already exists in FG, which would need to be integrated with the Canvas system, to be exposed as a dedicated Canvas element (kinda like the view manager rendering everything to a texture/osg::Geode). | |||
There's window setup/handling code in CameraGroup.cxx which sets up these slaved views and renders the whole thing to a osg::TextureRectangle, which is pretty much what needs to be extracted and integrated with a new "CanvasCamera" element - the boilerplate for which can be seen at: [Canvas | |||
The whole RTT/FBO texture setup can be seen here: http://sourceforge.net/p/flightgear/flightgear/ci/next/tree/src/Viewer/CameraGroup.cxx#l994 | |||
That code would be redundant in the Canvas context, i.e. could be replaced by a Canvas FBO instead. | |||
The next step would then be wrapping the whole thing in a CanvasCamera and exposing the corresponding view parameters as properties (propertyObject) so that slaved cameras can be controlled via Canvas. | |||
Otherwise, there is only very little else needed, because the CanvasMgr would handle updating the Camera, and render everything to the texture that you specified.<ref>{{cite web | |||
|url = https://forum.flightgear.org/viewtopic.php?p=260812#p260812 | |||
|title = <nowiki> Re: WINDOW IN WINDOW </nowiki> | |title = <nowiki> Re: WINDOW IN WINDOW </nowiki> | ||
|author = <nowiki> Hooray </nowiki> | |author = <nowiki> Hooray </nowiki> | ||