I am trying to display 2D images onto the screen (like a map with vehicles moving around on it). I would like to be able to scale these images and rotate them aswell. At the same time I would like to minimize distortion in these images. The images I am trying to display are simply a bunch of lines, polyline, polygones, etc... that are suppose to make up a wire frame display of maps and vehicles. 1. I am wondering which method of drawing/displaying these images is better (is faster an allows for scalling with the least distortion of the original image). Loading the image into a texture then binding it to a quad or drawing the images using Primatives? (The Textures would be loaded in the program as a Bitmap, and each Primatives points would be loaded into memory and then redrawn) 2. If I load the Primatives of one image into memory in my program from a file (as explained above). And I want to use this image as a background (Map). How do I display it on the screen without having to redraw the primitives everytime I want to update the map? Urg, sorry for being all over the place but I'm useless at explaining stuff only using text. Anyway, any help you can give me on my chaotic questions is much appreciated. Question at bottom of post aswell. Migs Edited by - Multiple Migs on April 26, 2001 5:36:25 PM

No offense intended, but it doesn''t make sence.
Either you''re spelling is wrong or you don''t know what the words you use excatly means...

Maybe you should try to talk about what you try to do at a higher level, like : how to do a 2D scrolling game with OpenGL.

-* So many things to do, so little time to spend. *-

Grrrr!!!

I know that it might not seem to make any sence but it is hard to explain.

The images I am displaying are made up of lines, polylines, polygones, etc... I just happens that they contain anywhere from 300 to around 40,000 primatives (40,000 is extreme and probably will be reduced). Accuracy is important because I am trying to simulate real world coordinates on the maps.

Currently, I have a file that contains data on how to draw images with primatives (lines, arcs, polylines, etc..). The only reason i''m using this method is because I am under the impression that loading the same types of images (in Bitmap format) into a texture would not allow me to scale the image with the same accuracy as when I draw it with primatives. Capeech.

I know you need to put textures onto primatives, but what I want to know is.

1. Is there a significant difference in accuracy of the displayed image when. One it is in texture format attached to a quad, or two when the lines, polylines, etc... of the image are drawn individually?

I somewhat new to Graphics programming (OpenGL and DirectX) but I have been in programming for sometime now so I am quite sure that my understanding of the terms are correct.

>>1. Is there a significant difference in accuracy of the displayed image when. One it is in texture format attached to a quad, or two when the lines, polylines, etc... of the image are drawn individually?<<

there shouldnt be *that* much, there will be some mind cause the lines are working from the original object theyre bound to be more acurate, also with lines you can do line antialiasing.
of note though using lines is gonna be far slower esp if youre drawing 40000 LINES just for one model, how much slower prolly in the region of seconds per frame (with antialiasing)


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Thank you all for you feedback!

I was also wondering if it is possible to Draw primatives onto a Bitmap, and then save the Bitmap as a texture? If the answer is yes, a nudge in the right direction would be greatly appreciated.

I want to do this so that I only have to redraw the primatives when I scale the image.

Thanks for yo time!

Mig

Thanks for the reply!

Dumb question coming up. But that just means it should be easy to answer. heh heh heh.

Is there are min/max/optimum size for textures? Can they only be glued to a certain size primative?

Thanks for all the help.

Mig