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Newcomers DBPro Corner / Need help on object rotation, etc.

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Sleet
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Joined: 3rd Aug 2003
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Posted: 16th Dec 2003 08:43
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There is a game example that comes with darkbasic, it's called tank or something. I plan on creating a game very similar to it and using parts of it as a template so that when I need to learn how to do something I am not totaly lost. But there is one very important part of the code that I cannoth figure out, that would be the part of the code that rotates the tank so that it seems the tank tracks are following the terrain.

What I am looking for is someone to explain to me the fundimentals of how it works. I am completely lost because there are some variables used that I can't figure out what they have to do with anything, and when I find out what is used to give the variables a value I find that the code uses other variables that seem tohave even less to do with the rotating andf tilting code than ever! One example would be a variable used in part to create another variable which is used in the section of rotating code, and that first variable is nothing more then half the x or z value of the matrix size! WTF? I am so lost but I'm dead in the water basicaly without a grasp of this code.
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ReD_eYe
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Posted: 16th Dec 2003 10:11
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without actually looking at it again(short of time) i'd guess that what it does is find the height of the ground at each corner of the tank, and then uses trigonometry to work out the angle required. thats not explained very well, but it might give you a hint


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Sleet
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Posted: 17th Dec 2003 05:59
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Things I'm looking for are like why you need to use variables like landsize# (that's one that's used in the code to create a variable used to help find the angles and it is half the value of the x or z length of the matrix that is used for the ground. Go figure.)
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Phaelax
DBPro Master
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Joined: 16th Apr 2003
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Posted: 17th Dec 2003 23:46
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Quote: "of the code that rotates the tank so that it seems the tank tracks are following the terrain."

I dont have the code in front of me either, but I can take a guess. It either rotates a limb, or uses a dummy object to control rotation. I know it uses a dummy object for the tilting and rotation on the landscape that way.
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Sleet
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Posted: 18th Dec 2003 07:30
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It does use a dummy object, but I can't even figure out why you would need one, can someone get the code in front of them? Every copy of DB (at least classic) has it.
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Sleet
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Posted: 20th Dec 2003 03:15
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anyone?
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Sleet
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Posted: 23rd Dec 2003 11:20
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bump

it's sad when I have to do this to get an answer I can use
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Scorpyo
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Joined: 26th Aug 2002
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Posted: 23rd Dec 2003 14:49
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go here and run my example code
http://darkbasicpro.thegamecreators.com/?m=forum_view&t=21427&b=1
check it out and let me know what you don't understand..
basically it's Lee's tank code re-used
cheers
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