a basic 3d engine

by **Jadam** » Dec 23, 2003 @ 4:32pm

I direct you towards these articles by our very own phantom

http://www.flipcode.com/articles/articl ... fx01.shtml

by **denthorq** » Dec 23, 2003 @ 5:55pm

Thanks

Happy Holidays !

by **izeman** » Dec 23, 2003 @ 11:55pm

by **Jadam** » Dec 24, 2003 @ 11:25pm

by **drgoldie** » Dec 25, 2003 @ 10:30am

i did not read that book but from the list of topics it covers i'd say that the software rendering part is not really covered there in large depth.

for writing a 3d engine with a software rasterizer i suggest you have a look at "Tricks of the 3D Game Programming Gurus-Advanced 3D Graphics and Rasterization".

although the book wastes lots of pages for code (instead of providing a good, final version of an implementation the author develops everything step by step) it's the best book i know about this topic. (anybody any other suggestions?)

besides this you can find lots of really good articles in the net...

i already thought about writing an article for one of the major game developer sites on how to start PocketPC game programming, which tools and libs to use, current bottlenecks, etc...

bye,
DANIEL

by **bluescrn** » Dec 25, 2003 @ 11:16am

Are there any sites/books around that discuss perspective correct texturing in fixed point? Everything I've found has been rather PC-oriented, using the FPU...

I had a go at it a while back, without a whole lot of success (precision/range problems)

by **drgoldie** » Dec 25, 2003 @ 6:42pm

the conversion from floating point to fixed point would be VERY slow - even on CPUs with floating point support. for this reason it makes no sense to use floating point texturing (except for high precision) in a software rasterizer.

i can recommend the texturing code at
http://www.gamedev.net/reference/articl ... cle338.asp

it does use floating point, but it's quite easy to convert it to fixed point (well, the gradients calculation can be problematic) and to use piecewise interpolation. i use a heavily modified version of this code in Klimt since i wanted to start from robust and clean code...

DANIEL

by **izeman** » Dec 28, 2003 @ 3:26am

by **sponge** » Dec 28, 2003 @ 3:28am

by **izeman** » Dec 28, 2003 @ 7:04am

i get around 14fps on my device. (the orgo has 670 faces)

you can check on yourself. warning! i've only tested on ipaq 3600. and i'm not quite confident if i accessed frame buffer the proper way

by **bluescrn** » Dec 28, 2003 @ 12:35pm

by hm » Dec 28, 2003 @ 8:54pm

by hm » Dec 28, 2003 @ 9:08pm

by hm » Dec 28, 2003 @ 9:13pm

by **izeman** » Dec 29, 2003 @ 2:41am

hmwill. i implemented your suggestion. the frame rate jumped for 14 to 22 fps. thanks a lot!

i opened my book "tricks...", i couldnt believe why it didn't mention this trick. and found that it did suggest a similar thing using a bias.

now if i could still find other ways to increase the speed to 30+fps. maybe i could already display a map/world.

i also recommend "tricks of the 3d gurus".. i learned a lot

a basic 3d engine

(NOT) clearing the z-buffer

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