# Programming - Games - OpenGL and C++

This toturial was written for me by Imran Khan (imranahmedkhan82@hotmail.com, iak1982@yahoo.com).
Copyright (c) 2004 is owned by Martin Baker

3D Rotation :

This Section will add rotationally motion to the 3d Objects , we just created in our previous Section. We have to add some lines to the existing method of ' DrawGLScene'.

we will use ' glRotatef ' method for rotation. 'glRotatef ' got 4 arguments , 1 st is the angle of rotation , 2nd is x-axis , 3rd is y-axis,4th is z-axis.

here is the code...

 glTranslatef(-1.5f,0.0f,-6.0f); glRotatef(rtri,0.0f,1.0f,0.0f); glBegin(GL_TRIANGLES);

We have just add one line " glRotatef(rtri,0.0f,1.0f,0.0f); " . rtri is an float type variable.We will use this variable so that the pyramid will be in rotation all the time.We only want rotation on Y-axis thats why we pass " 1.0f " in the 3rd argument.

Same as above we add one line for Cube rotation.

 glTranslatef(1.5f,0.0f,-7.0f); glRotatef(rquad,1.0f,0.0f,1.0f); glBegin(GL_QUADS)

We want rotation on X and on Z-axis as well thats why we pass "1.0f" in 2nd and 4th argument.

Now here is the increament and decrement for the 2 variable , " rtri" & "rquad", so that both object remain in rotation.

 rtri+=1.0f; rquad-=0.15f;

Simple we increament,decrement everytime when the method run. You can change its value to check the effent.Higer the value more fast it wil rotate.

Here will be the Output.

next: textures

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