yang686526

how to increase rendering speed?
how to increase rendering speed?
hello,
i've speed problem for the rendering in an application base on odamfcapp. the rendering is far too slow for some big drawing.
in the project singledoc, the rendering is much faster than in odamfcapp. i have try to figure out why but i think that it comes for more the one parameter. unfortunately, i can decrease the speed in singledoc by initializing the device as the same way as odamfcapp but i can't increase the speed in odamfcapp.
is someone can help me to explain me what are the differences which decrease the speed of rendering?
thanks in advance.
depending on file where may be different reasons:
1. rendering device wingdi/opengl/directx
2. if gs model and spatial index are used (if they are used it increases the time for first draw but speeds up sequential redraws)
3. rendering mode (2d optimized / shaded).
note that wingdi supports only 2d optimized mode (3d objects will be rendered via wireframe).
also singledoc does not use modelergeometry module so acis objects can't be supported (except rendering their wireframe in case it is cached in dwg file).
triangulating acis objects may take significant time at first draw.
for my test, i抳e try the 3 mode wingdi, opengl and directx on both project and for each mode the odamfcapp is much slower and the readering was in both project in mode ?d optimized?
i think the difference is really visible for any dwg bigger then 2mo. for the first draw, both program are slow but after the odamfcapp seems to take nearly the same time as the first draw (30 sec or more) and in the singledoc, the drawing takes (1 or 2 sec). is it possible that the modelergeometry cause those delays? i抳e try with some file without acis elements and it抯 exactly the same problem.
is it possible that the system for the command (odexeditorobject and all this stuff) decrease the rendering speed?
perhaps gs model is turned off in odamfcapp?
vladimir
yes, you're right. i'd missed this point... thanks a lot for your both answers.
i've a last question on this subject, what does the function enablegsmodel? what is the main difference if the gsmodel is enabled or disabled?

enablegsmodel
in two words: gs model enables cache for entities graphical data, i. e. on first frame (regen) all entities geometry will be cached into memory metafiles, on other frames this metafiles simply plays without additional calculations. if entity modified - only it metafile will be recalculated. so if gs model disabled, all geometry calculations will be processed on each frame.
thank you very much for the explanation