hdrr(hdr) for irrliht

kompromis · Post by **kompromis** » Fri May 11, 2007 12:59 pm

is there any way any of the next versions is going to have support for hdrr(hdr) http://en.wikipedia.org/wiki/High_dynam ... _rendering

zenaku · Post by **zenaku** » Fri May 11, 2007 4:04 pm

http://video.google.com/videoplay?docid ... 1975243299

kompromis · Post by **kompromis** » Fri May 11, 2007 7:17 pm

zenaku wrote:http://video.google.com/videoplay?docid ... 1975243299

well yes but thats a modified version of irrlicht i would like it to be official so you could have it in the latest version and so

Halan · Post by **Halan** » Wed May 16, 2007 8:26 pm

its not modified

like in any other engine youve to write the shader yourself and add it to the engine although a post processor class would be nice

greetings,
halan

kompromis · Post by **kompromis** » Sun May 20, 2007 4:17 pm

all i have seen is a modified version of irrlicht witch only could render with hdr when running in opengl mode

Ico · Post by **Ico** » Sun May 20, 2007 5:33 pm

There just isn't a prebuilt scene node for full screen post processing filters (but there are at least some code examples in the forum). It really depends on the complexity of the scene but as a "quick and dirty" solution I'd do the following (may look weird using huge objects etc. and may be slow depending on your blurring etc.):

Depending on your blur you may need more different nuances.

Let's define some distances/variables:
A: distance to the focused point
B: the range within you see everything sharp

Start ...
Render everything further away than A+B/2.
Blur the scene.
Render everything between A+B/2 and A-B/2.
Render everything nearer than A-B/2 to a texture.
Blur the texture.
Add the texture to the scene.
... finished

You could also blur everything using rescaled textures - should be quite fast then.

zenaku · Post by **zenaku** » Wed Jun 06, 2007 3:55 pm

HDR is not simply blur.

linkoraclehero · Post by **linkoraclehero** » Sat Jun 09, 2007 1:23 pm

For the most part, yeah, HDR is taking the image, blurring it, increasing it's intensity, then blending it at 50% with the main scene. From that point, you'd average the pixels in the center, and 4 corners, and use that for your overall screen intensity. If you don't believe me, load up Half-Life 2. The next step below HDR is Bloom (Will give the SAME effect, without the realistic feel of light-in-the-eyes intensity). All HDR is, is adding the matter of light to affect it. This is actually explained with pictures in Half-Life 2: Lost Coast.

.

Oh, also, there is no shader that is OpenGL Only. If anything, it's an OpenGL Shader File which can (With some work) be converted to a HLSL file for DirectX. (Atleast, I believe).

Luben · Post by **Luben** » Fri Jun 15, 2007 8:48 pm

Well, there are some nifty built-in variables in gl-shaders like the gl_NormalMatrix, which you have to pass manually in a dx-shader.

omaremad · Post by **omaremad** » Fri Jun 15, 2007 10:33 pm

btw before you touch those state variables rember one thing!!!!! Opengl has no world matrix, its model view so if your object is a child to the camera and the camera rotates gl_normalmatrix will not rotate your normals. i wasted 2 hours trying to find out this. so take care.

linkoraclehero · Post by **linkoraclehero** » Sun Jun 17, 2007 9:16 am

Well it's possible to do everything without shaders, i'd just be slow because you'd be doing thousands of maths a second... But Irrlicht needs a way to shader the screen nontheless. It seems DirectX is capable of this because the display context is composed of triangles... I'll look into allowing this.