3D Model Viewer - G-Sensor [NEW 2.0]

andrec · Sep 23, 2008

Koush said:
Couple things I'd also try:

Override OnPaintBackground and remove the base.OnPaintBackground call. There's no point using OnPaintBackground in GDI if D3D is painting. It can cause flickering.

Also, instead of using Device.Clear to clear the background, perhaps try using a polygonal colored/textured background? Device.Clear used to cause flickering behavior on some computer video cards. I think it has something to do with a device Clear not being a true render call, and handled as an asynchronous memset, which causes issues with making render calls immediately after the Clear. Another common workaround was to Clear the device AFTER the buffers were swapped, and not immediately before painting. The reason that works "better" is because the memset is given more time to complete before the next set of render calls are made. At least that's how it worked ~7 years ago when I was working on the Direct3D team...

I have been trying to reproduce this bug in OpenGL, and can't get it to happen anymore: my code doesn't do either of the things I mentioned.

I will try and see if I can get it better. You would think that those samples did it right

Most MSDN samples and other apps I've tried have this issue, so that's why I tend to see it as a driver problem.

And Koush, admit it, the actual reason you disassembled the code was to see if I used your sensor sdk

Koush · Sep 23, 2008

andrec said:
I will try and see if I can get it better. You would think that those samples did it right

Most MSDN samples and other apps I've tried have this issue, so that's why I tend to see it as a driver problem.

And Koush, admit it, the actual reason you disassembled the code was to see if I used your sensor sdk

Haha, no, I really was just looking to see what swap effect you were using.

hedgemonstahinz · Sep 23, 2008

well done

looks interesting, will download later.

NLS · Sep 24, 2008

hedgemonstahinz said:
looks interesting, will download later.

just letting us know?

Wolfer_CZ · Sep 27, 2008

Pretty cool. Is anybody here who wants to make a pokédex?

But seriously, 3D tamagotchi like this would be AWESOME!

andrec · Sep 27, 2008

gerDiamond said:
Please, please
I'd love to have a 3D T-Rex

Cool idea! A t-rex will look much cooler. I have worked on this today for version 2.0. Have a look at the new screenshot!

andrec · Sep 27, 2008

I noticed during development that the v-sync problem goes away if you connect the device to your computer (activesync). If I restart the device, it's back. Anyone can confirm this?

NLS · Sep 27, 2008

I cannot really confirm this. I just did the test. I think the refresh (the FPS probably) gets a bit lower so you perceive it as smoother. I think this is what happens in my device.

In any case if THAT is what happens, I don't like what we discovered.

Anyway I have two other things to note for V2.0:

1) Please smooth the sensor values... the graphic trembles even if you lay the device on a table!

2) Position of the mesh in 3D space feels wrong. You can't look the tiger in the eye when the device is face up and look the tiger from the top, then you hold the device in front of you!

3) (bonus

) When you hold the device directly in front (and the beast is seen from the top - which I disagree as you see in #2), in fact it goes nuts, because in very small value changes in this angle you change from seeing the device looking down or up... You (or all of us) have to think of a better reaction in the device position eh?

andrec · Sep 27, 2008

NLS said:
I cannot really confirm this. I just did the test. I think the refresh (the FPS probably) gets a bit lower so you perceive it as smoother. I think this is what happens in my device.

In any case if THAT is what happens, I don't like what we discovered.

Yes, I noticed that the FPS got lower, but if you zoom in the model it is very obvious that the v-sync problems almost disappear.
I tried to insert a delay in the code to force a lower FPS, but that did not help as the activesync did.

NLS said:
Anyway I have two other things to note for V2.0:

1) Please smooth the sensor values... the graphic trembles even if you lay the device on a table!

2) Position of the mesh in 3D space feels wrong. You can't look the tiger in the eye when the device is face up and look the tiger from the top, then you hold the device in front of you!

3) (bonus ) When you hold the device directly in front (and the beast is seen from the top - which I disagree as you see in #2), in fact it goes nuts, because in very small value changes in this angle you change from seeing the device looking down or up... You (or all of us) have to think of a better reaction in the device position eh?

#1 is fixed.
#2 and #3 is due to how the g-sensor works. If you have the device front, it doesn't output any rotation changes.

itsallsubliminal · Sep 28, 2008

i saw a hologram 3d program for the iphone, with an animated character walking...

it would be real cool if the T-rex was "on the prowl" as you rotated him and such!

btw, i'm getting the flickering too, seems like the app is SUPER sensative to the g-sensor...

this is a cool lil app tho, love it!

Mr.Sir · Sep 28, 2008

The Iphone 3d stuff was fake, it has been confirmed before.

itsallsubliminal · Sep 28, 2008

well then, can it be done on our phones? Pull off something that the iphone had to fake?

NLS · Sep 28, 2008

no - except if your model has a real compass embedded

itsallsubliminal · Sep 28, 2008

NLS said:
no - except if your model has a real compass embedded

a compass is what enables a "video" or "animated" image in an app like this?

NLS · Sep 28, 2008

of course, because this is not related to g-sensor, but to device orientation on a plane

itsallsubliminal · Sep 28, 2008

NLS said:
of course, because this is not related to g-sensor, but to device orientation on a plane

oooo, now that you say that, and thinkin deeper into it, you r right... thanks for that...

oh well, this app is still great and has sooo much potential! Cant wait to see more

andrec · Sep 28, 2008

Ok guys, the beast is released!
Let me know what you think!

NikPraskaton · Sep 28, 2008

Plz... set some background...

It would be much nicer.. Ill give this new version a try and tell you my opinion for improvements..

Nikola...

NLS · Sep 28, 2008

...wow... talking about a huge jump in file size

(lucky me I have a touch pro not a diamond)

andrec · Sep 28, 2008

NLS said:
...wow... talking about a huge jump in file size

(lucky me I have a touch pro not a diamond)

It is a high-poly model

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