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Re: How to control the order of the objects to draw [using object graphics] [message #64905]

Wed, 28 January 2009 13:09

Mark[1]
Messages: 66
Registered: February 2008

Member

By default, the Object Graphics system controls visibility of
overlapping objects according to the position in the Z direction. So
if you want object A drawn in front of object B, put A above B
(greater Z).

It's a bit more complicated for IDLgrVolumes--for more info, search
this group for the word "pimento".

There are are a few object properties that modify this behaviour. The
effect of depth can be modfied by changing an IDLgrModel's
DEPTH_TEST_FUNCTION property. The effect of depth can be disabled by
setting an IDLgrModel's DEPTH_WRITE_DISABLE to 1; in this case the
visibility of objects in that model is controlled by position in the
container. Line-type atoms can be made to appear in front of filled
atoms at the same using the DEPTH_OFFSET function.

However I suggest you start by leaving the depth-cuing properties at
their default values and using depth (Z position) to control
visibility.

Mark

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[Message index]

		Re: How to control the order of the objects to draw [using object graphics] By: Mark[1] on Wed, 28 January 2009 13:09
		Re: How to control the order of the objects to draw [using object graphics] By: natha on Tue, 27 January 2009 12:13
		Re: How to control the order of the objects to draw [using object graphics] By: David Fanning on Tue, 27 January 2009 12:04

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