(solved) Animatorless animations

[kormoran]

I'm trying to move scene nodes without animators, since there are no predefined tracks to follow.
Problem is, ISceneNode::setRotation() and ISceneNode::setPosition() functions does not work

Here is a trying I'm doing with setRotation(), I tried setPosition() too

Code: Select all

while((MyApp.IsRunning())&&(IrrDevice->run()))
{
    FrameNow  = IrrDevice->getTimer()->getTime();
    TimeFrame = FrameNow - FramePast;
    FramePast = FrameNow;
    DoPhysics(TimeFrame);    // Time unit: milliseconds
 
// rest of game loop etc. etc...
 
void DoPhysics(u32 ms) 
{
    GrabRot.rotateXYBy(ms*0.002f, GrabRot);
    GrabRot.rotateXZBy(ms*0.001f, GrabRot);
    cube->setRotation(GrabRot);
};

The cube does not move nor rotate, just stays still what's wrong with this code?

[CuteAlien]

Nothing wrong so far. I guess the bug is in another place.

[mongoose7]

What is the initial value of GrabRot? And why are you casting a vector to Euler angles? If GrabRot is initially (0, 0, 0) it will stay (0, 0, 0). And I'm guessing it is.

Unless I miss my guess, I'm thinking you need to start from scratch and think this thing through.

[kormoran]

What is the initial value of GrabRot? And why are you casting a vector to Euler angles? If GrabRot is initially (0, 0, 0) it will stay (0, 0, 0).

You guessed right. However, changing it to a (initial) random value did no good.
I'm just trying to animate a cube, this is a rotation but it could be any other transformation. I'm casting a vector because setRotation() requires a vector to work. If you can suggest a better method you are welcome

[CuteAlien]

Argh, sorry that I missed that (my excuse is having a bad flu right now, can't really think...). mongoose7 is on the right track. You are mixing up direction vector and euler angles. rotateXYBy does rotate a direction vector. While setRotation expects euler angles (telling how many degrees to rotate around each axis). Rotating a rotation value won't work (you are trying to rotate an angle... there is no meaning for that). To increase an angle just add/subtract to the value instead. Start by rotating just around one axis (for example y). So it's just GrabRot.Y =+ something.

[kormoran]

It works now. I already had some clues that setRotation() argument wasn't really a vector... I suppose I'm also to blame for not having investigated deeper. Oh well.

Until next trouble folks