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Basic Transformation


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#1 codder88   Members   -  Reputation: 103

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Posted 09 February 2013 - 01:02 PM

triangle.png

 

Hello everyone,

 

I have that triangle and I want to move top vertex, how can I do that?



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#2 slicer4ever   Crossbones+   -  Reputation: 3226

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Posted 09 February 2013 - 07:15 PM

open up your favorite 3D modeling software, select it, and move it over.

 

seriously though, if you only want to move a single vertex, then you need to change it's position before you submit it to the gpu.

 

without seeing what your doing with code, and you telling us what u've learned/why your having problems, then we can't help you.


Edited by slicer4ever, 09 February 2013 - 07:15 PM.

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#3 __SKYe   Members   -  Reputation: 952

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Posted 15 February 2013 - 08:59 AM

IF you're using the old OpenGL, then you're probably using something like this to draw the triangle:

I assume you're using glBegin()/glEnd() pairs, since you don't know how to move a vertex.

glBegin(GL_TRIANGLES);
glVertex3f(-1.0f, -1.0f, 0.0f);
glVertex3f( 1.0f, -1.0f, 0.0f);
glVertex3f( 0.0f,  1.0f, 0.0f); //In this example this is the top vertex
glEnd();

 

So in this code, the top vertex is the last, so to move it, change the values of the last glVertex3f() call.



#4 blueshogun96   Crossbones+   -  Reputation: 817

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Posted 16 February 2013 - 06:52 PM

I'm a bit confused, do you want to make the triangle a bit taller, or do you actually want to use OpenGL's transformation functions to "resize" it?

 

Shogun.


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