Item setTransform

#1 The axis you are rotating around is defined as Vector(%rx, %ry, %rz), and the %angle is how much you're rotating around it. So to rotate around the z axis do setTransform(_, _, _, 0, 0, 1, angle);

Ian

#2 Angle Axis is something to google for. My understanding of this is that the X,Y, and Z values are like a percentage (between 0 and 1) of the angle. So when you do as Ian suggested, above, you only get rotation on the Z axis.

- Brett

#3 Hello,

Thanks for the answers guys, it basically works the same way as gl. However that does not explain how this example works.

// Game programming all in one
function TurnShape(%shape, %angle) {

%xfrm = %shape.getTransform();
%lx = getword(%xfrm, 0);
%ly = getword(%xfrm, 1);
%lz = getword(%xfrm, 2);
%rx = getword(%xfrm, 3);
%ry = getword(%xfrm, 4);
%rz = getword(%xfrm, 5);

%angle += 1.0;
%rd = %angle;

%shape.setTransform(%lx SPC %ly SPC %lz SPC %rx SPC %ry SPC %rz SPC %rd);
}

if rx, ry and rz are a value between 0 and 1 so you know what axis to rotate around then why are we getting the value from the shape.

Again thanks for your help.

Ben

#4 Because the shape already has it's rotation axis set.

In p. 108, when you create the new item, it sets the rotation to "0 0 1 0".

The function ensures some portability since each shape will carry it's own rotation axis.

Therefore you read it before applying the rotation.

BTW, in the documentation forum I started a thread asking the guys at GG to create a special area for this book.

#5 Ahh, that would explain it. Thanks a lot, I must have missed that.

Ben

#6 Hello,

The area for the book would be great. The book is great for learning Torque and having a forum here would be a great complement to that.

Ben