Scope in OpenGL?

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Started by NaliXL December 10, 2001 05:15 PM

1 comment, last by NaliXL 22 years, 4 months ago

NaliXL

120

Author

December 10, 2001 05:15 PM

Hi there, Never tried, but just wondering : can I use scope in OpenGL? Like :

  
glRotatef(rotation-rate,x,y,z);
glBegin(GL_TRIANGLES);
	glrotatef(rotation-rate,x,y,z);
	glBegin(GL_TRIANGLES);
		//object no. 1

	glEnd();

	glrotatef(rotation-rate,x,y,z);
	glBegin(GL_TRIANGLES);
		//object no. 2

	glEnd();
glEnd();

Okay, I know this code probably won''t work (cause of GL_TRIANGLES), but it''s just for the idea. Making 2 objects, rotate each of them separately, and then rotate both of the objects as if they where one object. Are such things possible? Thanks!

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Null and Void

1,088

December 10, 2001 05:24 PM

You can kind of do what you want (if I understand) like this:

  glRotatef(FirstVal,x,y,z);glPushMatrix();  glRotatef(SecondVal,x,y,z);  glBegin(GL_TRIANGLES);    // ...  glEnd();glPopMatrix();glPushMatrix();  glRotatef(ThirdVal,x,y,z);  glBegin(GL_TRIANGLES);    // ...  glEnd();glPopMatrix();

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merlin9x9

174

December 10, 2001 05:53 PM

No, because you can only use a subset of OpenGL commands between glBegin and glEnd. You can have OpenGL "remember" previous states (though not for the drawing mode as in your example), using the glPush* and glPop* commands. This is particularly useful for matrices.

Scope in OpenGL?

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