single colour rectangles on a single surface
Blitz3D Forums/Blitz3D Programming/single colour rectangles on a single surface
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| I'm using a single surface system for my graphics, and want to be able to draw a rectangle of a single colour onto this surface. I don't believe Vertex Colours would do the trick, as using them means I can't use my brush (and therefore all my graphics can't be displayed). The best way I can think of is to have a section of the texture I use set aside, and draw on it a single pixel of the required colour. I can then use this as the u,v coords for the quad and the rectangle will be textured as required. However, such a method means I have to have the colours I want to use predefined. Not really a problem, but considering this texture is split into tiles which can be loaded or deleted as appropriate, I have to set aside one whole tile for this information - or implement a system of smaller tiles for one section of the texture. Before I begin all that, I ask "Is there a simpler way to achieve what I want?" It could save me a lot of work. Ta. |
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| Why can't you use a brush with vertex colors? |
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| The manual gives me the impression that you can either use vertex colouring, or textured brushes, but not both. I haven't tested yet, so maybe that's not true. Do you know for sure? |
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| Yes :) Just keep a white pixel on your texture and stretch that across the tris where you want a plain color. Then color it using vertex colors. Remember to set the BrushFX to 2 to enable vertex colors. |
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| What happens if I don't set the u,v coords on the vertex? I did that and it comes out as a white texture which can be coloured using vertex colours (set the FX). What is the default if you don't set u,v? |
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| the default u,v if you create a vertex is 0,0 which is the top left hand corner of the texture. |
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| That makes sense now. So I'll just ensure there's a pixel free for my purposes. |
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