Irrlicht Engine

Posted: **Wed May 26, 2004 4:04 pm**

If you were trying to make flight or car simulator than you probably encoutered problem with setRotation() function. It uses so caled Euler angles. Here is way hove to get rid of it using matrix4 class. When writing this code I was largely inspired by Steve Baker's article at http://sjbaker.org/steve/omniv/eulers_are_evil.html

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vector3df r = node->getRotation(); //get current rotation (euler)
matrix4 m;
m.setRotationDegrees(r); //set firsth matrix to current rotation

//use one you need:
vector3df rp = vector3df(angle,0,0); //pitch
//vector3df rp = vector3df(0,angle,0); //turn
//vector3df rp = vector3df(0,0,angle); //roll

matrix4 mp;
mp.setRotationDegrees(rp); //set second matrix to rotation to add

m *= mp; //multipy them

r = m.getRotationDegrees(); //get rotation vector from matrix (euler)
node->setRotation(r); //rotate node

There is bug in matrix4::getRotationDegrees() function, you have to apply this fix in order to get it right:
http://irrlicht.sourceforge.net/phpBB2/ ... php?t=2234

Another bug in matrix4 class can be fixed like this:
http://irrlicht.sourceforge.net/phpBB2/ ... php?t=2458

Posted: **Thu May 27, 2004 9:24 am**

Arrr... I just found out that there is something wrong with pitch and roll when Y rotation is 0.0 or 180.0 ...but can't find reason.

EDIT:
It was bug in matrix4 class, above code works fine now...

Posted: **Mon Jul 12, 2004 12:25 pm**

Why do you call the overloaded operators like this?

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m.operator*=(mp);

Overloaded operators can be used like an operator on an intrinsic type

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m*=mp;

There's no need to call it like a function, that's the whole point of overloaded operators

Posted: **Mon Jul 12, 2004 5:53 pm**

I notices that two but I didn't want to say anything because I have done stupier things than that

Posted: **Mon Jul 12, 2004 7:04 pm**

well ..ti wasn't my intention, its just some stupid mistake I overlooked when copy and paste from diferent file and than repeated throught same metod again and again...

I decided to edit firsth post since originaly it was bit confusing...

Posted: **Fri Mar 12, 2010 1:50 am**

hey, i know i've been bugging you on the forums, but let me ask you question

using your code from this post, my character which i call from animatedmeshscenenode->getmesh(),

he rotates relatively. what i mean by this is, when i look at him he doesn't stay put and rotate, he moves around in a circle. Using the getposition and printing the information out, it stays the same, but its obvious he isn't in the same position. How would i adjust this code to make him turn around himself. I have a camera node as well.

Posted: **Fri Mar 12, 2010 9:38 am**

Can you set up test case (which shows your problem) and post code here while sending me your model you use for animated node?

Posted: **Sat Mar 13, 2010 12:56 am**

figured it out. scaling problem

Irrlicht Engine

How to get turn pitch roll with Irrlicht

How to get turn pitch roll with Irrlicht