Smooth rotation

[3DModelerMan]

How can I change this code

Code: Select all

if ( receiver.IsKeyDown(KEY_UP) )
{
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y-180 , 0 ) );
}

if ( receiver.IsKeyDown(KEY_RIGHT) )
{
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y-90 , 0 ) );
}

if ( receiver.IsKeyDown(KEY_LEFT) )
{
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y+90 , 0 ) );
}

if ( receiver.IsKeyDown(KEY_DOWN) )
{
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y , 0 ) );
}

if ( receiver.IsKeyDown(KEY_RIGHT) && receiver.IsKeyDown(KEY_UP) )
{
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y-135 , 0 ) );
}

if ( receiver.IsKeyDown(KEY_LEFT) && receiver.IsKeyDown(KEY_UP) )
{
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y+135 , 0 ) );
}

if ( receiver.IsKeyDown(KEY_RIGHT) && receiver.IsKeyDown(KEY_DOWN) )
{
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y-45 , 0 ) );
}

if ( receiver.IsKeyDown(KEY_LEFT) && receiver.IsKeyDown(KEY_DOWN) )
{
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y+45 , 0 ) );
}

so that it would rotate my character smoothly between key presses?
I tried just rotating until it hit the value greater than what it should be but then adding an extra less than test made horribly buggy.
Should I use animators maybe?
Thanks .

[sp00n]

ups, but as i understood of your code, when you've pressed UP and RIGHT for example:

Code: Select all

if ( receiver.IsKeyDown(KEY_UP) ) 
{ 
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y-180 , 0 ) ); 
}
if ( receiver.IsKeyDown(KEY_RIGHT) ) 
{ 
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y-90 , 0 ) ); 
}
...
if ( receiver.IsKeyDown(KEY_RIGHT) && receiver.IsKeyDown(KEY_UP) ) 
{ 
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y-135 , 0 ) ); 
}

you'll get a -180 and -90 and -135 to your Y-coord. Right?
And about smooth - can you explain more without long verses like

until it hit the value greater than what it should be but then adding an extra less than...

?

[3DModelerMan]

Sorry I'll explain better, I was in a hurry to finish last time. Right now it just suddenly sets the rotation. I want it to rotate until it gets to the angle it should be based on the keypress. if I just rotate it until the angle tests
greater than what it should be, it won't rotate from other angles. And if I add an extra less than in there to rotate the other way, when I do the other directions it gets all messed up.

[hayate]

Sorry I'll explain better, I was in a hurry to finish last time. Right now it just suddenly sets the rotation. I want it to rotate until it gets to the angle it should be based on the keypress. if I just rotate it until the angle tests
greater than what it should be, it won't rotate from other angles. And if I add an extra less than in there to rotate the other way, when I do the other directions it gets all messed up.

Why don't you try coding your own idea and if it doesn't work write your code here to ask what have you done wrong?

[Acki]

Why don't you try coding your own idea and if it doesn't work write your code here to ask what have you done wrong?

simply because it wouldn't be a typical 3DModelerMan-question then...
just search for his posts and you'll see...

[Pyritie]

I'm actually writing something like this right now.

[zillion42]

3DModelerMan,

i really wasnt sure what to say, but then again somehow i felt sorry... now you've got a whole saturday night and sunday to get it working, considering the amount of time you're obviously spending, i think you should..
the thing is... the word 'smooth' somehow contradicts your code in every thinkable way...
And if you think about it, you should come to the same conclusion...
Now irrlicht renders how many times per second ?
So if you want to smoothly rotate something, how much do you have to rotate in each render (frame) ?



Obviously the answer is, on every frame you have to rotate only a very little amount...
try...

Code: Select all

if ( receiver.IsKeyDown(KEY_RIGHT) )
{
 render_mesh->setRotation( vector3df( 0 , cam_control->getRotation().Y + 0.2 , 0 ) );
} 

and see what happens...

[Pyritie]

Almost done here. I'll just add averaging then I'll be done. :3

[3DModelerMan]

I know that I should rotate by a tiny amount every frame
(I even have my rotation for other stuff time based). But what I need to know is how to stop it from rotating once it gets to a certain point. All the stuff I've tried made it go crazy and I deleted the code to keep trying so I can't post the code.

[hayate]

Simply because it wouldn't be a typical 3DModelerMan-question then...
just search for his posts and you'll see...

Unfortunately I know his typical question very well because I started reading this forum some months ago....and this makes me say:

I know that I should rotate by a tiny amount every frame
(I even have my rotation for other stuff time based). But what I need to know is how to stop it from rotating once it gets to a certain point. All the stuff I've tried made it go crazy and I deleted the code to keep trying so I can't post the code.

The question contains the answer sometimes....keep trying and shows us some code, I assure you that you're not so far away from the (simple) solution

[randomMesh]

stop it from rotating once it gets to a certain point

Pseudocode:

Code: Select all

if (node is at certain point)
{
    dontRotateAnyMore = true;
}

or

Code: Select all

if (!node is at certain point)
{
    rotateNode();
}

Please note that the comparison of floats in C++ isn't as trivial as it seems to be.
A good reading might be this paper.

[Pyritie]

http://irrlicht.sourceforge.net/phpBB2/ ... hp?t=32520