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6.9

OpenGL layers and transparency

Asked by stuart-the-legend in OpenGL Graphics & Game Programming, Graphics & Game Programming, 3D Game Programming

Tags: opengl c layers transparency paint draw image

G'day All,

I'm slowly working my way through tutorials and code trying to get my head around OpenGL. What I am trying to do is program a very simple game:

1. Have an image as a background, for example, a battleground with enemy installations
2. Have the background image obscured by a black veil
3. Be able to paint transparently on sections of the black veil to remove the "fog of war"
4. Transparent sections reveal parts of the battleground, ie the underlying image

My first question: is this scenario possible with OpenGL? My second question: how do I go about doing this?

I am using OpenGL 1.1 and writing the game in C. Most of the tutorials I have been through show how to paint sprites onto a screen, but there's not a lot of attention paid to blending and transparency.

Any help appreciated. Thanks for reading.
[+][-]03/21/09 09:40 AM, ID: 23947912Accepted Solution

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Zones: OpenGL Graphics & Game Programming, Graphics & Game Programming, 3D Game Programming
Tags: opengl c layers transparency paint draw image
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Solution Provided By: InteractiveMind
Participating Experts: 2
Solution Grade: B
 
[+][-]04/18/09 12:28 AM, ID: 24174273Assisted Solution

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[+][-]04/18/09 06:06 AM, ID: 24175114Assisted Solution

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