Draw 3D Line Color Incorrect

[HondaDarrell]

I have drawn a 3D line with different color or alpha, but only black is rendered. I am using SCOLOR(A,R,G,B) for color and direct3d9 for the driver.

What could be causing this?

Also, is it possible to increase the width of a line.

[kevinlynx]

i've no idea what happened to your code . But in my example code, i rendered a line every frame and the color is correct . And the color , of cource you must use SColor because the parameter is a SColor type.

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driver->draw3DLine( vector3df( 0, 100, 0 ), vector3df( 0, 0, 0 ), SColor( 255, 255, 0, 0 ) );

ps:
Did your render loop like this :

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    render a line
    scene manager draw all 

I think if you did that , i mean , draw a line before ISceneManager::drawAll , you will get a blank line . I suppose you should :

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manager->drawAll();      
driver->draw3DLine( vector3df( 0, 100, 0 ), vector3df( 0, 0, 0 ), SColor( 255, 255, 0, 0 ) );

And the color now will be correct . good luck .

[vitek]

As with rendering other 3D primitives, you need to remember to set the material and transform before you draw them. If you don't add a dynamic light, set the material to disable lighting, or enable ambient lighting, the line won't be lit and will appear black.

Travis

[JP]

You can't increase the width of the line unfortunately as then i guess it wouldn't technically be a line.. more a rectangle...

Not sure what other options there are, other than rendering a rectangle instead of a line. Or i suppose as it should be in 3d you'd want to render a cube that's stretched out.

[hybrid]

OpenGL does increase the line width, only d3d does not. This is a limitation in the architecture and can only be avoided by using a mesh instead of a line. This is, however, not yet done.