CODEWITHSUNDEEP
c++opengl3d
Cipher
Cipher

Reputation: 6102

Applying multiple simaltaneous rotations to same figure

I have a simple rectangular shape in my application which I am rotating fixing one of its side, and rotating around the X axis. The rotation looks something like the following figure (grey denotes the current rotation that I am getting with this figure)

enter image description here

I am using the following code to get this rotation

glPushMatrix();
glTranslatef(position of the axis point which has to be fixed for rotation);
glRotatef(rotationAmount, 1,0,0);
glTranslatef(-position of the axis point which has to be fixed for rotation);
Rectangle(xPosition, Position,200,100);
glPopMatrix();

However, I have to rotate this same figure with an additional rotation around y axis around one of its side (green arrow direction in the figure). How do I rotate this rectangle such that it keeps on rotating around x-axis and around y-axis simaltaneously?

EDIT: I did try adding another glRotatef(rotateAroundYaxis amount,0,1,0) but the output does not actually looks like what I was expecting. The figure rotates in two quadrants instead of rotating around y-axis like a simple page turn.

While if I try these two rotations independently using only one of them in the program (not both of them together), i.e.

glRotatef(rotateAmount,1,0,0);
glRotatef(rotateYamount,0,-1,0);

I do get the required X and Y rotations independently, but when together, it combines into some weird rotation effect.

Upvotes: 1

Views: 460

Answers (2)

BЈовић
BЈовић

Reputation: 64283

You need to change this :

glRotatef(rotationAmount, 1,0,0);

into this :

glRotatef(rotationAmount, 1,1,0);

Upvotes: 0

Bernd Elkemann
Bernd Elkemann

Reputation: 23560

It sounds like you just want the following. If you dont please tell and i will change it.

glPushMatrix();
glTranslatef(position of the axis point which has to be fixed for rotation);
glRotatef(rotationAmount, 1,0,0); // <- keep this but also
glRotatef(rotationAmountAroundYAxis, 0,1,0); // <- add this
glTranslatef(-position of the axis point which has to be fixed for rotation);
Rectangle(xPosition, Position,200,100);
glPopMatrix();

Upvotes: 1

Related Questions