IRR4Delphi(cool efect)

[djoker]

keys : q and w - speedup the plane




toyplane.rar

[JP]

Hehe nice one, do you use a physics engine for that?

Cool trails but i'd say the speed increase/decrease should be slower as if you hold the key down for more than a split second it just jumps to the max/min.

[shadowslair]

Really nice indeed!!!

JP is right. Just increase the sensivity of the key presses.

Ah, and that trail is just awsome. Though I don`t think I`ll use it, is there any chance of posting some code or at least explain the principle of it? Plz

[JP]

The principle is fairly simple, i've seen them posted before and i think someone posted source for them as well so you might find it if you search.

Basically you have a triangle strip like this:

Code: Select all

-----------
|\   |\   |
| \  | \  |
|  \ |  \ |
-----------

Or thereabouts... my ascii art ain't too hot

And you build up this tri strip progressively putting the new vertices at the position of the plane so it leaves a trail behind it. And then you fade out the oldest vertices and then remove them when they're completely transparent. Applying a nice texture with an alpha channel or alpha blending will give you a nice result.

That's basically it, not very well explained but hopefully you get the idea!

[Halifax]

Yup, that was a good explanation JP. This also can be applied to other things such as in car games where they draw a darken alpha blended triangle strip when it skids.