Hans Mittendorf

how about real time ray tracing under Jitter?

real-time-ray-tracing

There are fairly involved shaders that do raytracing. You'll need a

really good graphics card as well. Here's a link to a shader done in

http://www.icare3d.org/content/blogcategory/25/48/lang,fr/

There are fairly involved shaders that do raytracing.  You'll need a
really good graphics card as well.  Here's a link to a shader done in
DirectX that will get you started:

ooohhhhh.... this calls for being played with. Thanks!

On Sep 9, 2007, at 1:04 PM, Wesley Smith wrote:

> There are fairly involved shaders that do raytracing. You'll need a

> really good graphics card as well. Here's a link to a shader done in

> There are fairly involved shaders that do raytracing.  You'll need a
> really good graphics card as well.  Here's a link to a shader done in
> DirectX that will get you started:
>
> http://tonfilm.blogspot.com/
>
> Als this done in GLSL
>
> http://www.icare3d.org/content/blogcategory/25/48/lang,fr/
>
> wes

I think this one is all in Cg. Still looks good enough to invest some

> Als this done in GLSL
>
> http://www.icare3d.org/content/blogcategory/25/48/lang,fr/

I think this one is all in Cg.  Still looks good enough to invest some
time into.


Since I launched the question, I am not sure to be the best to answer your request but I have found a conference about it which is going on here

http://www.cs.lth.se/home/Tomas_Akenine_Moller/

Since I launched the question, I am not sure to be the best to answer your request but I have found a conference about it which is going on here
http://www.uni-ulm.de/rt07/RT07.html

also the prvious one
http://www.cs.utah.edu/~thiago/papers/

and the good old Akenine
http://www.cs.lth.se/home/Tomas_Akenine_Moller/

has anyone played with akenines soft shadow shaders? they look great. Im on a mac and I think there dx shaders if Im not mistaken so I cant use them.. man it would be awesome if someone converted!

has anyone played with akenines soft shadow shaders?  they look great.  Im on a mac and I think there dx shaders if Im not mistaken so I cant use them.. man it would be awesome if someone converted!


Akenine's stuff is for PC. I am wondering lately why Apple is not doing like it did with monitors to support DVI and to support PC graphics cards. It really sucks to luck behind PC's on graphics performance. Does anyone know why they insist on their own standard?

Akenine's stuff is for PC.  I am wondering lately why Apple is not doing like it did with monitors to support DVI and to support PC graphics cards.  It really sucks to luck behind PC's on graphics performance.  Does anyone know why they insist on their own standard?


>> Does anyone know why they insist on their own standard?

but then again they are trying to be extremely compatible with parallel desktop and the like.

what are you guys talking about? You mean being able to buy graphics 

cards? Or open gl support? 10.4 has good openGl support, especially 

with the addition of multithreaded openGL, and 10.5 supports openGL 2.0.

if by cards, that isnt an apple issue, thats a 3rd party vendor issue.

On Sep 23, 2007, at 10:16 AM, Hans Mittendorf wrote:

> Akenine's stuff is for PC. I am wondering lately why Apple is not 

> doing like it did with monitors to support DVI and to support PC 

> graphics cards. It really sucks to luck behind PC's on graphics 

> performance. Does anyone know why they insist on their own standard?

what are you guys talking about? You mean being able to buy graphics  
cards? Or open gl support? 10.4 has good openGl support, especially  
with the addition of multithreaded openGL, and 10.5 supports openGL 2.0.

>
> Akenine's stuff is for PC.  I am wondering lately why Apple is not  
> doing like it did with monitors to support DVI and to support PC  
> graphics cards.  It really sucks to luck behind PC's on graphics  
> performance.  Does anyone know why they insist on their own standard?

I am not a graphics hardware specialist but when you go to ATI or Nvidia you have two different cards, one for PC and one for the Mac.

I would be happy to have just one card fitting all computers.

I am not a graphics hardware specialist but when you go to ATI or Nvidia you have two different cards, one for PC and one for the Mac.
I would be happy to have just one card fitting all computers.


I don't follow Hans. Following their own standard on what?

> Akenine's stuff is for PC. I am wondering lately why Apple is not doing like it did with monitors to support DVI and to support PC graphics cards. It really sucks to luck behind PC's on graphics performance. Does anyone know why they insist on their own standard?

I don't follow Hans.  Following their own standard on what?

On 9/23/07, Hans Mittendorf  wrote:
>
> Akenine's stuff is for PC.  I am wondering lately why Apple is not doing like it did with monitors to support DVI and to support PC graphics cards.  It really sucks to luck behind PC's on graphics performance.  Does anyone know why they insist on their own standard?
>


reality does not work that way. The bios and drivers are completely 

different, due to completely different OS systems and booting 

sorry to boost your bubble. Maybe once PC OEMS move to EFI, then 

On Sep 23, 2007, at 2:52 PM, Hans Mittendorf wrote:

> I am not a graphics hardware specialist but when you go to ATI or 

> Nvidia you have two different cards, one for PC and one for the Mac.

> I would be happy to have just one card fitting all computers.

reality does not work that way. The bios and drivers are completely  
different, due to completely different OS systems and booting  
architecture.

sorry to boost your bubble. Maybe once PC OEMS move to EFI, then  
perhaps.

>
> I am not a graphics hardware specialist but when you go to ATI or  
> Nvidia you have two different cards, one for PC and one for the Mac.
> I would be happy to have just one card fitting all computers.

His work uses shadow volumes which requires quite a bit of setup and

uses alot of resources. Additionally, as he even states in the docs

about his techniques, it doesn't scale to complex/dynamic scenes. The

entire process requires 4 rendering passes variously to the depth,

stencil, and color buffers. If you have a decent sized scene, you'll

On 9/23/07, Nicholas C. Raftis III wrote:

> has anyone played with akenines soft shadow shaders? they look great. Im on a mac and I think there dx shaders if Im not mistaken so I cant use them.. man it would be awesome if someone converted!

> -=ili!ili=- www.Axiom-Crux.net -=ili!ili=-

His work uses shadow volumes which requires quite a bit of setup and
uses alot of resources.  Additionally, as he even states in the docs
about his techniques, it doesn't scale to complex/dynamic scenes.  The
entire process requires 4 rendering passes variously to the depth,
stencil, and color buffers.  If you have a decent sized scene, you'll
quickly hit your card's fill rate limit.

On 9/23/07, Nicholas C. Raftis III  wrote:
>
> has anyone played with akenines soft shadow shaders?  they look great.  Im on a mac and I think there dx shaders if Im not mistaken so I cant use them.. man it would be awesome if someone converted!
> --
> -=ili!ili=-  www.Axiom-Crux.net  -=ili!ili=-
>


For a really hardcore method, check this paper out: Real-time Soft

Shadows in Dynamic Scenes using Spherical Harmonic Exponentiation (

http://research.microsoft.com/users/kunzhou/publications/SHExp.pdf

Again, this would require some serious rejigging of the geometry to

get working but it looks amazing. Realtime shadows on arbitrary

scenes is essentially an unsolved problem right now. There are many

techniques for as many different types of scenes and geometry

representations. The way things are in jitter right now, simple

shadow mapping is the most straightforward to get working. In fact,

you can take the projective texture patch/shader I posted a few months

ago and by changing a few lines in the shader code turn it into a

shadow mapping shader. The only additional thing you'll need is a

depth texture rendered from the light's point of view. Unfortunately

shadow mapping has many many problems like aliasing, suface acne, no

For a really hardcore method, check this paper out: Real-time Soft
Shadows in Dynamic Scenes using Spherical Harmonic Exponentiation (
http://research.microsoft.com/users/kunzhou/publications/SHExp.pdf ) .
 Again, this would require some serious rejigging of the geometry to
get working but it looks amazing.  Realtime shadows on arbitrary
scenes is essentially an unsolved problem right now.  There are many
techniques for as many different types of scenes and geometry
representations.  The way things are in jitter right now, simple
shadow mapping is the most straightforward to get working.  In fact,
you can take the projective texture patch/shader I posted a few months
ago and by changing a few lines in the shader code turn it into a
shadow mapping shader.  The only additional thing you'll need is a
depth texture rendered from the light's point of view.  Unfortunately
shadow mapping has many many problems like aliasing, suface acne, no
self-shadowing or blockers etc.

i would love to see a demo of the real-time soft shadows.

those final images in the pdf looked pre-rendered. really amazing that those are dynamic.

i wonder if you could use the same sphere set for physics calculations...

i would love to see a demo of the real-time soft shadows.
those final images in the pdf looked pre-rendered. really amazing that those are dynamic.

i wonder if you could use the same sphere set for physics calculations...


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Parklane City Lahore is the flagship housing project of Platinum Life Developers (Pvt) Ltd. Located in a serene and pristine part of north Lahore, Parklane City is ideally situated at Faizpur Interchange, just minutes away from several key destinations.