COLOUR SIMPLE OBJECTS USING GL_LINES ETC.....

OpenGL OpenGL: Basic Coding
1

hey guys,

I am just starting up on OpenGL and have done some graphics using GL_LINES and GL_LINE_STRIP.

I have seen many examples on how to colour in a polygon but not an object that was created using lines etc…

Is it possible to colour in a cube that was done with lines manually???

Thanks

2

No. I’m guessing you want something like the “flood-fill” tool found in paint packages, but OpenGL doesn’t work that way. If you want filled area, you’ll need to draw them filled.

3

If you want to have the polygons filled, you can’t do it with glBegin(GL_LINES); or glBegin(GL_LINE_STRIP); As the name shows, these only draw the LINES between the points. You need to draw in GL_TRIANGLES, GL_QUADS, GL_POLYGON, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, or GL_QUAD_STRIP (I think)

(Don’t worry, I’m just starting too.)