Software Rendering School, Part II: Projection

DmEditor · 11-30-2003, 12:19 AM

Software Rendering School, Part II: Projection
Authors: Mihail Ivanchev and Hans Thörnquist
Description: The second part of the series introduces projection in software rendering. Sample source code is included.

anubis · 12-06-2003, 03:33 AM

hehe, it's always amusing again to see how easily the eye can be tricked into seeing that wobbling cube

Noor · 12-06-2003, 10:58 AM

Nice article!!

What is the next one going to be about?

baldurk · 12-06-2003, 02:19 PM

From the article:

Quote:

Next time, we will talk about geometry in 3D and triangle rasterizing. 'Till then, cya!

Mihail121 · 12-08-2003, 03:25 AM

Hi guys!

10x for the responce, i need stuff like that really (: ) . First to Anubis - yep it's pretty cool visual illusion and might sound weird but there are some eye specialist that use this kind of trick to test for the diopter range of the humans. Anyway no problem if you solve the cube in your head. I really like that effect too.
About the next part of the article - yeah it will introduce drawing triangles which is the next great step towards the cool 3d graphics. I'm working in the moment on it...

anubis · 12-08-2003, 05:03 AM

i haven't figured out yet when the cube starts to get distorted. i imagine that the brain gets confused when certain lines intersect so that it can't make up the cube shape anymore...

Mihail121 · 12-09-2003, 03:08 AM

Simple my friend

. According to some documents on internet: "the cube's loses it's shape when lines that belong to the logically back sides of the cube are drawn infront of the lines that belong to the logically front sides.".

anubis · 12-09-2003, 11:19 AM

with all the lines having the same color it doesn't matter which lines are drawn first...

Mihail121 · 12-10-2003, 03:07 AM

Yep that's true

i guess something else is also important then. If not the computer than the mind is playing tricks i guess (boy i'm smart ;7)

anubis · 12-10-2003, 03:28 AM

amazing...

dogbear · 12-06-2006, 07:28 PM

Hi Mihail and thanks for a great article!
Can you tell me why you didn't put the perspective projection calculations in a matrix? Seems strange to introduce the use of matrix for rotation and parallel projection and not do it for perspective projection.
But, again, thanks for the article.
Another question: Is it much of a leap to continue on to the view frustum area? I've gotten clipping working but I'm having a hell of a time trying to make the frustum rotate so that a fly-through of my 3D world can be achieved.
Thanks.

Nick · 12-07-2006, 10:14 AM

Don't transform the frustum. Instead, transform the world!

12-06-2003, 03:33 AM	#2
anubis DevMaster Staff Join Date: Apr 2003 Location: Germany Posts: 2,328	hehe, it's always amusing again to see how easily the eye can be tricked into seeing that wobbling cube ___________________________________________ If Prolog is the answer, what is the question ?

12-06-2003, 10:58 AM	#3
Noor Senior Member Join Date: Jan 2003 Location: ON, Canada Posts: 524	Nice article!! What is the next one going to be about? ___________________________________________ "What ever happened to happily ever after?"

12-08-2003, 05:03 AM	#6
anubis DevMaster Staff Join Date: Apr 2003 Location: Germany Posts: 2,328	i haven't figured out yet when the cube starts to get distorted. i imagine that the brain gets confused when certain lines intersect so that it can't make up the cube shape anymore... ___________________________________________ If Prolog is the answer, what is the question ?

12-09-2003, 11:19 AM	#8
anubis DevMaster Staff Join Date: Apr 2003 Location: Germany Posts: 2,328	with all the lines having the same color it doesn't matter which lines are drawn first... ___________________________________________ If Prolog is the answer, what is the question ?

12-10-2003, 03:28 AM	#10
anubis DevMaster Staff Join Date: Apr 2003 Location: Germany Posts: 2,328	amazing... ___________________________________________ If Prolog is the answer, what is the question ?

11-30-2003, 12:19 AM	#1
DmEditor DevMaster Editor Join Date: Jan 2005 Posts: 54	Software Rendering School, Part II: Projection Authors: Mihail Ivanchev and Hans Thörnquist Description: The second part of the series introduces projection in software rendering. Sample source code is included.

12-08-2003, 03:25 AM	#5
Mihail121 Senior Member Join Date: Jan 2003 Posts: 868	Hi guys! 10x for the responce, i need stuff like that really (: ) . First to Anubis - yep it's pretty cool visual illusion and might sound weird but there are some eye specialist that use this kind of trick to test for the diopter range of the humans. Anyway no problem if you solve the cube in your head. I really like that effect too. About the next part of the article - yeah it will introduce drawing triangles which is the next great step towards the cool 3d graphics. I'm working in the moment on it...

12-09-2003, 03:08 AM	#7
Mihail121 Senior Member Join Date: Jan 2003 Posts: 868	Simple my friend . According to some documents on internet: "the cube's loses it's shape when lines that belong to the logically back sides of the cube are drawn infront of the lines that belong to the logically front sides.".

12-10-2003, 03:07 AM	#9
Mihail121 Senior Member Join Date: Jan 2003 Posts: 868	Yep that's true i guess something else is also important then. If not the computer than the mind is playing tricks i guess (boy i'm smart ;7)

12-06-2006, 07:28 PM	#11
dogbear New Member Join Date: Dec 2006 Location: Dublin, Ireland Posts: 1	Re: Software Rendering School, Part II: Projection Hi Mihail and thanks for a great article! Can you tell me why you didn't put the perspective projection calculations in a matrix? Seems strange to introduce the use of matrix for rotation and parallel projection and not do it for perspective projection. But, again, thanks for the article. Another question: Is it much of a leap to continue on to the view frustum area? I've gotten clipping working but I'm having a hell of a time trying to make the frustum rotate so that a fly-through of my 3D world can be achieved. Thanks.

12-07-2006, 10:14 AM	#12
Nick Senior Member Join Date: Aug 2004 Location: Ghent, Belgium Posts: 1,056	Re: Software Rendering School, Part II: Projection Don't transform the frustum. Instead, transform the world!

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