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beginner's question: moving a quad and changing the light...

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Hi, I''ve 2 questions. 1. How can I move a quad (or a triangle, or a cube etc.) infinitely from one side of the window to the other. (for example from left to right, and then right to left). I don''t want to control it by keyboard or mouse. 2. Is there a way of changing the intensity of the light (which is in Lesson 7) by pressing a key? For example pressing "+" will make the object brighter while "-" makes it darker. Thanks...

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I'm still no guru, but this is how I would have done it. I'm sure it's plenty of other possibilies, but however. Here goes.

Say you want to move the triangle by the X axis.

int iXaxis = 0;

glBegin(GL_TRIANGLES); // Drawing Using Triangles
glVertex3f( 0.0 +iXaxis, 1.0, 0.0); // Top
glVertex3f(-1.0 +iXaxis,-1.0, 0.0); // Bottom Left
glVertex3f( 1.0 +iXaxis,-1.0, 0.0); // Bottom Right
glEnd(); // Finished Drawing The Triangle

then later on int the main game loop, you + or - on the iXaxis to move the Triangle the direction you desire.

I think this will work, havent tried it for myself. As I said, I'm no guru, and I'm still just a beginner myself when it comes to OpenGL. So if anyone else has another way to do this, go ahead.

Kenneth Wilhelmsen
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Edited by - kenwi on July 29, 2001 11:48:33 AM

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You can also move a point of view in the same way (glTranslate(xpos,ypos,zpos)) and then change x- y- zpos.

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Since I''ve had a pause in OpenGL programming for some time now I doesn''t remember the exact functions, but changing the brightness of ligth must be sth. like:
glLightColor(GL_LIGHT1, intensity, intensity, intensity);
Here intensity can reach from 0..1 where one is the brightest and 0 is off.
When using glTranslate to move your object rember that all objects painted after your square will be also moved, to avoid this you can either move after it in the negative direction, or push and pop the translation matrix.

Greetings Ben

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