WPF 3D POINT DRAWING

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Hello, I need to draw a point in 3D using WPF. I am using class ScreenSpaceLines3D to draw a line in 3D, but I'm not able to draw point in 3D (while zooming). Can anybody help me? Some example code would be appreciated. :-)

Posted 24-Aug-11 7:35am

emsik

Updated 24-Aug-11 21:25pm

v4

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Sergey Alexandrovich Kryukov 24-Aug-11 13:54pm

Not clear. By the way, size of a point is oxymoron. :-)
--SA

emsik 25-Aug-11 10:19am

Sorry, I am just beginner looking for help. It is clear now? :-)

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Andrew Rissing · Answer 1 · 2011-08-24T09:35:00

Solution 1

Why not just Google for what you're wanting...

http://www.google.com/#sclient=psy&hl=en&source=hp&q=ScreenSpaceLines3D+example&pbx=1&oq=ScreenSpaceLines3D+example&aq=f&aqi=g1&aql=&gs_sm=e&gs_upl=578l2837l0l2931l8l4l0l4l4l0l147l254l0.2l2l0&bav=on.2,or.r_gc.r_pw.&fp=165bfefa6b75e1a2&biw=1680&bih=986&safe=images[^]

Posted 24-Aug-11 9:35am

Andrew Rissing

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emsik 24-Aug-11 16:10pm

I already use that class, but I don't know and can't find how to modify it to "ScreenSpacePoints3D"?

Andrew Rissing 24-Aug-11 22:22pm

Shooting from the hip here without actually trying, you could make the start/end points to be at the same. If that doesn't work, you might be better off making a sphere and just making it rather small. Just a few ideas.

emsik 25-Aug-11 3:39am

I have tried both before posting of question. First, doesn't work. Second is possible but I don't know how to separately manage object (small cube/sphere) screen size while manipulating (zooming) of model. I have "points", "lines", areas and solids in model view, so I need constant "points" objects screen size, zoom only length of "lines" (I use ScreenSpaceLines3D for that) and use common zooming for areas and solids while model manipulating.

I found this
http://social.msdn.microsoft.com/Forums/en-SG/wpf/thread/07911e37-d291-42b8-a8c1-8383901dc702

but there is no source code.

Andrew Rissing 25-Aug-11 6:32am

Well, you could tie into the event you're using to zoom and change the size of the sphere.

Or just leave it as is. Because if I zoomed in on a point, I would expect it to grow.

emsik 25-Aug-11 8:05am

Hm, now you understand my problem and go through same ideas as I did :-) but:
1. How to get screen size of displayed object (say screen circle radius for sphere) and re-size object during zooming to have same screen size?
2. Is this idea good way with focus to performance, because I need to display thousands of "points" and other objects in 3D space?
3. Reason is that I want to draw some real solids and in addition to be able optionally draw wire-frame lines and also edges of solids, therefore I can't leave it. My "point" is not real size object, just geometric entity with its ID and three coordinates in space, but without dimension. I need just "dot" like 1pxl on screen to show user "there is a point/node N ID[x,y,z]"