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Geek Culture / Website about 3D Maths?

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Hamish McHaggis
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Posted: 18th May 2003 14:33
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I have found some and have learnt a bit about the subject, but they really don't go into much detail about why the equations that they give are so, much of the stuff I have learnt is by looking at the equations and working out what they mean for myself.

My current GCSE text book only touches on vectors and matrices and what they are, but nothing about geometry really. I would be really grateful if anyone could give me addresses for good websites that really explain in easy terms, the basics of 3D maths.

Thanks
Why the hell'd you ask me for crying out loud!?!

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Rob K
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Location: Surrey, United Kingdom
Posted: 18th May 2003 18:54 Edited at: 18th May 2003 18:55
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http://www.geometryalgorithms.com

Might help.

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Shadow
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Posted: 18th May 2003 20:38
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If you really wanted you could buy an A-Level textbook. It would give more depth than GCSE, but not necessarily enough.
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Martyn Pittuck
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Posted: 18th May 2003 23:10
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One thing you may want to look for is A-Level Maths, i look at geometry and algebra at A-Level even though i am at GCSE, i find GCSE a bit too easy, although there is always one Q in the higher exam that kills me for example:

V = S + (SRT/100)

Make S the subject, anyone know?

PS i do know the answer after 2 hours of number crunching

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spooky
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Posted: 18th May 2003 23:46
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After 5 minutes came up with:

S=100V/(RT+100)

(awards himself a pat on the back)

Gronda, Gronda
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spooky
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Posted: 18th May 2003 23:49
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Explanation for those that really wany to know:

V=S+(SRT/100)

V-S=SRT/100

SRT=100(V-S)

SRT=100V-100S

SRT+100S=100V

S(RT+100)=100V

S=100V/(RT+100)

Gronda, Gronda
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Hamish McHaggis
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Posted: 19th May 2003 00:21
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I thought I had it but then I realised that...

SRT/100 <> S/100+R/100+T/100

Oh well, thanks for your help.

Why the hell'd you ask me for crying out loud!?!

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Martyn Pittuck
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Posted: 19th May 2003 10:40
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hehe

In an exam situation it takes too long to do all the steps required.

I went through it the way i had been taught, but it did not work as my method started getting too complicated.

Anyhowz i still passed top of year for the mock

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Rob K
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Posted: 19th May 2003 12:39
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Mentally I skipped quite a few of the stages which sonic posted, I went straight to stage 4, not a good idea in the exam though. Just getting from the penultimate to the final stage had me confused for a moment. Yes, tricky one that.

Still, this year the mock exam was apparently a lot more difficult than in previous years - 62% was an A* !! (using Edexcel's sample paper). I wonder how much higher it will be in the real thing (I would have thought at least 80%, more likely 85%)

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Martyn Pittuck
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Posted: 19th May 2003 12:50
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It all depends on how you see the problem.

I find it easy to viuslise some algebra and not other stuff.

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Dave J
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Posted: 22nd May 2003 17:28
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V = S + (SRT/100)
V - (SRT/100) = S
S = V - (SRT/100)

Was looking pretty good to me...

"Computers are useless they can only give you answers."
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spooky
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Posted: 22nd May 2003 17:51
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Ehhh, S is still on both sides!

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