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Dark GDK / how to do effect like this?

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Taoie
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Joined: 29th Mar 2008
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Posted: 13th Jun 2008 11:45
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in the picture ..a light effect follow object..

how to do like that
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geecee3
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Posted: 13th Jun 2008 16:36
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that was done using a collection of textured plains with ghosting mode 2 and ZWrite disabled, the plains simply spawn sequentially at the position of the object one plain per game frame played in a fixed rate scenario. So if the object moves, the plains it leaves where it used to be 'appear' to make a trail that follows the object. None of the trail plains actually move. its a very basic effect anyone can do easily in very few lines of code.

regards, geecee3.

Ohd Chinese Ploverb say : Wise Eskimo, not eat yerrow snow.
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Taoie
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Posted: 14th Jun 2008 07:47
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Arr.. I'm so new about effect like this..
Can any one sample code ^v^
thx so much
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tobi453
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Posted: 14th Jun 2008 11:39 Edited at: 14th Jun 2008 11:40
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There are at least to ways of doing this, an easy way and a complex one. You can either use a collection of quadratic textured plains that are set to camera orientation (the easy way, but you need many plains to make it look like a continous line) or you can rotate and position plains in a way that they create a line without gap (you need less plains for this and it looks better). Look for example at this pic of my star wars game (attached). The cable is a line that consists of many plains. You must also rotate the plains around the z-axis depending on camera position and calculating this angle is not easy. You can avoid this problem by using cylinders but cylinders have more polys than plains.

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