Programming Forums > Application Development > C++

cypher_soundz · Apr 7th, 2005, 11:33 AM

For my project i need to write some code that will proform Anti-aliasing to a 3d box.
i think i get the main idea of how it works, but not exaclty sure how to implement it.
Any graphics gurus out there?
Regards
cyph

Cerulean · Apr 7th, 2005, 12:19 PM

Share with us "the main idea of how it works" and what API you're using for drawing the box and we'll try and help you

cypher_soundz · Apr 7th, 2005, 3:38 PM

by "the main idea of how it works" i mean Anti-aliasing in general.
I'm using a universitys internaly made graphics liberary named gwin
i really need any pointers or theorys on how to implement it, i hope i have provided everything , im using Visual C++ 6.0.
Regards
cyph

Dizzutch · Apr 7th, 2005, 5:17 PM

what alnti-aliasing does it it takes the pixels around one pixel and bases the color of the middle pixel off the colors of the outer pixels. that's the basic algorithm it makes things smoother. a google search for "anti-aliasing algorithm" came up with more than enough information.
good luck
Dizz

Cerulean · Apr 7th, 2005, 5:20 PM

You want to implement the AA algorithm yourself?

I'm surprised the graphics library doesn't provide AA built in.. Even OpenGL, pretty much as low level as it gets, handles it for you.
You need to work with the line and calculate where the lighter pixels need to be placed for a smoother effect. There'll be a fair bit of maths involved.
Sorry I can't be of more help

cypher_soundz · Apr 7th, 2005, 5:31 PM

great thankyou all, i had the basic concept , jsut didnt know exaclty how . it seems like it should be ok. yes i need to implement it myself lol

thanks agian everyone you have been great help
Regards
cyph

Rei · Apr 10th, 2005, 2:43 AM

What are you using for your 3d API? That's the critical issue. Unless you're writing your own 3d engine... is that the case? If so, your antialiasing should be in your polygon draw routine - and that, in turn, really comes down to Wu line antialiasing of the edges, in which you use the percentage of the way to the next pixel over to determine how much you weigh one choice over the other.

cypher_soundz · Apr 10th, 2005, 4:17 AM

@Rei yes thats the case, and thanks for the info. i have the draw polly function and all the rest all ready coded, so the anti aliasing shouldn't be too hard to implement as its gonig to only be a few lines in the for loop.
Regards
cyph

Apr 7th, 2005, 11:33 AM	#1
cypher_soundz Newbie Join Date: Jan 2005 Posts: 15 Rep Power: 0	Anti-aliasing For my project i need to write some code that will proform Anti-aliasing to a 3d box. i think i get the main idea of how it works, but not exaclty sure how to implement it. Any graphics gurus out there? Regards cyph

Apr 7th, 2005, 5:17 PM	#4
Dizzutch Professional Programmer Join Date: Dec 2004 Location: Worcester, MA Posts: 441 Rep Power: 4	what alnti-aliasing does it it takes the pixels around one pixel and bases the color of the middle pixel off the colors of the outer pixels. that's the basic algorithm it makes things smoother. a google search for "anti-aliasing algorithm" came up with more than enough information. good luck Dizz __________________ naked pictures of you \| PFO F@H stats

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Apr 7th, 2005, 12:19 PM	#2
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	Share with us "the main idea of how it works" and what API you're using for drawing the box and we'll try and help you

Apr 7th, 2005, 3:38 PM	#3
cypher_soundz Newbie Join Date: Jan 2005 Posts: 15 Rep Power: 0	by "the main idea of how it works" i mean Anti-aliasing in general. I'm using a universitys internaly made graphics liberary named gwin i really need any pointers or theorys on how to implement it, i hope i have provided everything , im using Visual C++ 6.0. Regards cyph

Apr 7th, 2005, 5:20 PM	#5
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	You want to implement the AA algorithm yourself? I'm surprised the graphics library doesn't provide AA built in.. Even OpenGL, pretty much as low level as it gets, handles it for you. You need to work with the line and calculate where the lighter pixels need to be placed for a smoother effect. There'll be a fair bit of maths involved. Sorry I can't be of more help

Apr 7th, 2005, 5:31 PM	#6
cypher_soundz Newbie Join Date: Jan 2005 Posts: 15 Rep Power: 0	great thankyou all, i had the basic concept , jsut didnt know exaclty how . it seems like it should be ok. yes i need to implement it myself lol thanks agian everyone you have been great help Regards cyph

Apr 10th, 2005, 2:43 AM	#7
Rei Newbie Join Date: Apr 2005 Posts: 6 Rep Power: 0	What are you using for your 3d API? That's the critical issue. Unless you're writing your own 3d engine... is that the case? If so, your antialiasing should be in your polygon draw routine - and that, in turn, really comes down to Wu line antialiasing of the edges, in which you use the percentage of the way to the next pixel over to determine how much you weigh one choice over the other.

Apr 10th, 2005, 4:17 AM	#8
cypher_soundz Newbie Join Date: Jan 2005 Posts: 15 Rep Power: 0	@Rei yes thats the case, and thanks for the info. i have the draw polly function and all the rest all ready coded, so the anti aliasing shouldn't be too hard to implement as its gonig to only be a few lines in the for loop. Regards cyph

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