3D clipping

[kiroukou]

Hello

I'm actually working on a 3D engine, and today I need to implement the clipping of faces. But in fact I don't understand how to do it
I didn't find a lot of courses on the internet talking about it.
So if someone has a good link, or can explain it to me, it would be great

thanks , kiroukou

[colorblind]

I don't know exactly what you want to do,
but I can give you these two links:

http://www.macromedia.com/devnet/mx/.../flash_3d.html
http://www.macromedia.com/devnet/mx/...d_classes.html

The first link is also in a post in this forum ... did you search?

[kiroukou]

Hello
Yes I know those links And I performed a search before making this post.

My problem is very precise, and I need some explanation of the technique of clipping.

Here is an example of my engine : http://pagesperso.laposte.net/kiroukou/camera2/
As you can see there's a problem sometimes.

Is there anybody who knows clipping technique ?
++

[kiroukou]

Nobody can help me ?
I'm sure you can

[AndreMichelle]

hi thomas :o)

moving to the english zone ?

Try to get something out of this script:

    //-- polygon clipping

    var polyClip = [];

    var vi = vt.length;    // vt = vertices from polygon (x,y,z)

    while ( --vi > -1 ) {

        var p1 = vt[ vi ];

        if ( vi == 0 ) {

            var p2 = vt[vt.length - 1];

        } else {

            var p2 = vt[ vi - 1 ];

        }

        if ( p1.ty >= 0 || p2.ty >= 0 ) {

            if ( p2.ty < 0 ) {

                var dy = p1.ty - p2.ty;

                polyClip.push ( p1 );
                polyClip.push ( { tx: p1.tx - ( p1.tx - p2.tx ) / dy * p1.ty, ty: 0, tz: p1.tz - ( p1.tz  - p2.tz  ) / dy * p1.ty } );

            } else if ( p1.ty < 0 ) {

                var dy = p2.ty - p1.ty;

                polyClip.push ( { tx: p2.tx - ( p2.tx - p1.tx ) / dy * p2.ty, ty: 0, tz: p2.tz - ( p2.tz  - p1.tz  ) / dy * p2.ty } );
                polyClip.push ( p2 );

            } else {

                polyClip.push ( p1 );
                polyClip.push ( p2 );

            }

        }

    } 

I have no short example here right now, but you will get it :)

[kiroukou]

Hello Andre

AndreMichelle said
moving to the english zone ?

Yes I have to, english speaker are more obliging

I have no short example here right now, but you will get it

Yes I understand it
Thank you for your help, I will try it right after my short hollyday

Danke
++