Technical Q&A
QD3D 63 - Setting Data For Q3ViewerUseData (11-July-97)
Q
I've defined a pane where I want to display 3D objects with the 3DViewer. There is no problem if I
load the 3D data from a file and use 'Q3ViewerUseFile'. But I couldn't figure out how I
have to set the data for the 'Q3ViewerUseData' routine. From where do I get the 'size'?
A
According to chapter 2 "3D Viewer" pg. 2-10 of
3D Graphics Programming
with QuickDraw 3D: "You use the Q3ViewerUseData function to specify a 3D model whose
data is already in memory (either on the Clipboard or elsewhere in RAM). Q3ViewerUseData
takes a reference to an existing viewer object, a pointer to the metafile data in RAM, and the number
of bytes occupied by that data. "
Basically, the data you pass to Q3ViewerUseData must be in 3dmf object format.
For example, if the user had copied a 3dmf file from the scrap.
In this case, you would get the size of the data from the Scrap Manager. Take a look
at the Tumbler & Podium sample in the QD3D SDK for an example.
-- Scott Kuechle
Worldwide Developer Technical Support
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