Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.graphics.algorithms > #882

Re: figured part out; new questions

Cross-posted to 2 groups.

Show all headers | View raw

On 06/23/2012 03:40 PM, Johann Klammer wrote:
> I did not read your code, but what you need to read/google/whatever
> seems to be "perspective projection". The division thing essentially
> causes those parts farther away to appear smaller. Parallel projection
> or orthographic basically omits this step. what is left to do afterwards
> is scaling the resulting image to your screen coordinates.
> As I hardly use the openwatcom graphics thingy anymore, I do not know
> the correct factors to use.

Thanks; I found that Abe's Demo School discusses it, though it
contradicts Denthor's tutorials, which seem to have a mistake. I had
also tried to derive rotation matrices myself, but failed, so I got them
from the VLA text files again. Open Watcom is not a graphics thing: it
is a compiler.

> You should look up perspective projection and coordinate transformations
> in a decent maths book. You may also want to read 'The Red Book'. It is
> available online and contains a primer on the various types of
> transformations(Chapter 3). The coordinate systems are openGL specific,
> and may require adaptation to your case. 'The Blue Book' may also be
> worth a look.

Can you or anyone recommend the top 3D maths or 3D graphics books, even
if they are over 1000 pages? I would prefer something that uses C or
C-style C++ if anything. I looked at 'The Red Book,' but it was not as
clear as Abe's Demo School.

I will attach my fixed code, but I am going to do a new version, because
now some stuff is hard, coded in.

Back to comp.graphics.algorithms | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

questions about rotating cube graphics in C++ (aiming for C) David Melik <dchmelik@hipplanet.com> - 2012-06-22 00:53 -0700
  figured part out; new questions David Melik <dchmelik@hipplanet.com> - 2012-06-22 03:19 -0700
    Re: figured part out; new questions David Melik <dchmelik@hipplanet.com> - 2012-06-22 04:33 -0700
      Re: figured part out; new questions Johann Klammer <klammerj@NOSPAM.a1.net> - 2012-06-24 00:40 +0200
        Re: figured part out; new questions David Melik <dchmelik@hipplanet.com> - 2012-06-23 19:29 -0700
          Re: figured part out; new questions Nobody <nobody@nowhere.com> - 2012-06-25 22:40 +0100
            Re: figured part out; new questions Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2012-06-26 00:20 +0200
          Re: figured part out; new questions legalize+jeeves@mail.xmission.com (Richard) - 2012-06-29 18:59 +0000
        Re: figured part out; new questions David Melik <dchmelik@hipplanet.com> - 2012-06-23 19:36 -0700
          Re: figured part out; new questions JohnF <john@please.see.sig.for.email.com> - 2012-07-01 13:50 +0000
            Re: figured part out; new questions David Melik <dchmelik@hipplanet.com> - 2012-07-08 22:36 -0700

csiph-web