30 replies to this topic

[them4n!ac]

3D Ball Physics Example




Download ballz3d.gm6

[Pie Person!]

This is great! Thank you .

[ce gamer]

Nice example but after rolling around a little it gives an error:
ERROR in
action number 3
of Collision Event with object wall_block
for object ball:

Error in code at line 14:
ang_vel=nvel*tvel/n_length;
at position 30: Division by 0.

[them4n!ac]

Fixed! Thanks!

[icuurd12b42]

I guess my post did not stick...Weird


Can you explain how this is different that Quaternion (if it is) and how to set the rotation speed relative to the radius?

Edited by icuurd12b42, 28 November 2008 - 06:50 PM.

[them4n!ac]

I don't know much about quaternions and the way I set the rotation speed is my own idea, and I don't set the rotation speed relative to the radius, because it's fixed here.

[icuurd12b42]

I don't know much about quaternions and the way I set the rotation speed is my own idea, and I don't set the rotation speed relative to the radius, because it's fixed here.

I'm asking because this is much less code than what I have right now... I have balls of various radius though. So, if you know how to, it would be great.

[them4n!ac]

Get a physics book because I don't remember exactly how to do it.. There will be something about moving in a circle, I think you can use that.

[Tepi]

Well, I haven't really studied the course yet (and I'm so damned about it), but as far as I know, the rotation speed is indirectly relative to angular momentum, and that momentum, it is propotional to the ball's radius (and obviously its mass): solid ball 2/5*mr²; hollow ball 2/3*mr². Besides, it's not a good idea to calculate speeds in simulating physics; it's all about forces and accelerations.

@them4n!ac:
Although I'd like to know how to simulate it accurately, this comes to show that you can get a very realistlic effect by just using some logic. This is for sure an useful example for many people. Good job.

[goldsonic46]

Is credit needed?

[them4n!ac]

Tepi: thank you!
goldsonic46: of course!

[infinitygames]

Physics? Were? this is just the D&D function to bounce of walls.... Althought the ball rotations its suitable

[Tepi]

Physics? Were? this is just the D&D function to bounce of walls.... Althought the ball rotations its suitable

The ball doesn't rotate by itself...

[them4n!ac]

there's the trick!
GM calculates the reflection vector with the bounce function and I use it!

[AngelPL98]

I will use it! I hope: You can create a 3d Online Ball Game!

[them4n!ac]

If you want to use it with more balls, the drawing code must be changed.

[infinitygames]

You would probably get a better and faster effect with GM newton...

[Tepi]

You would probably get a better and faster effect with GM newton...

Yeah, and we'd probably get much better graphics with C++.

Now please let's not go to that.

[Phantom107]

You would probably get a better and faster effect with GM newton...

Yeah, and we'd probably get much better graphics with C++.

Now please let's not go to that.

He's right though.

I've been using GMNewton a while back and now examples like these feel fake.

[infinitygames]

You would probably get a better and faster effect with GM newton...

Yeah, and we'd probably get much better graphics with C++.

Now please let's not go to that.

He's right though.

I've been using GMNewton a while back and now examples like these feel fake.

He said it.... look into it! its realy good :3