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Subject: Less lazy faked hdri: semi-advanced tutorial


madmax_br5 ( ) posted Tue, 11 February 2003 at 5:12 PM · edited Sun, 12 January 2025 at 5:31 PM

Attached Link: http://fartur.free.fr/galerie/tutorial/qtvr-tutorial.html

This is advanced because I am not gonna explain much: Make 6 faces by following the above tutorial link. Then add in masked objects to the faces using photoshop or equivalent. Convert to an equirectangular map using hdrshop (debevec.org/HDRShop) Then back in photoshop blur that image. Now use it in bryce as a simulated hdri. So you can add-delte any objects you want without worrying about poly count!


Ornlu ( ) posted Tue, 11 February 2003 at 6:25 PM

What??? This makes no sense...Spherical mapping is much MUCH more accurate to the initial image...Why would you want to make it look worse and take more time? Maybe it's just me, but I don't get Why you'd want to do it this way. "less lazy"???


JDWohlever ( ) posted Tue, 11 February 2003 at 6:43 PM

// Code for Less Lazy Reaction to Message by MadMax Br5 // version: 0.1a // 02/11/2003 // ---------- // include cricket.h insert crickets_chirping.wav Sleep 500 //Loop If madmax = new post then restart else goto LOOP : LOOP Echo "Ok.. That made no sense what so ever." Echo " Make a square, the turn it into a blur," Echo " Then map it back onto a sphere??????" Do Action(Bang_Head_Against_Wall)x4 CLS Return


madmax_br5 ( ) posted Tue, 11 February 2003 at 10:16 PM

sigh I guess I will have to explain it a little better. LOL New tut posted soon...


Ornlu ( ) posted Tue, 11 February 2003 at 10:27 PM

It's not that, I just don't understand what you're after. I still stand behind the spherical long/lat mapping as it provides for the best ambient lighting and reflection mapping.


madmax_br5 ( ) posted Wed, 12 February 2003 at 12:00 AM

ohh yes the end result of the tutorial is to produce on of those maps, but customized. You can render a scene in bryce, then add 2d objects of your choice, then convert that image to a perfect lat/long map.


madmax_br5 ( ) posted Wed, 12 February 2003 at 12:26 AM

Attached Link: http://fartur.free.fr/galerie/tutorial/qtvr-tutorial.html

file_45580.jpg

Here's the first part.... Set up a scene and render as suggested in the above tutorial. You should have 6 images like the ones in the above pic (resized and layout for web viewing, they should be separate pictures)


madmax_br5 ( ) posted Wed, 12 February 2003 at 12:27 AM

oops i had a repeat picture in the previous postabove, please ignore it.


madmax_br5 ( ) posted Wed, 12 February 2003 at 12:29 AM

file_45581.jpg

part 2... Now arrange your pictures in vertical cross form. You will have to rotate the two side pictures.


madmax_br5 ( ) posted Wed, 12 February 2003 at 12:30 AM

the above is like an unfolded box...


madmax_br5 ( ) posted Wed, 12 February 2003 at 12:46 AM

file_45582.jpg

If you wish, at this point add in any objects that you want to include into the scene (2d clipart, masked photos, etc. This way you can easily customize an HDR scene for any projects without having to do a new render. In the above simple example I added abad tree to the front and a photo of a car to the side. Rember to rotate if it's on the sides :)


madmax_br5 ( ) posted Wed, 12 February 2003 at 12:48 AM

Attached Link: http://www.debevec.org/HDRShop/tutorial/tutorial4.html

Now make sure you have HDRshop installed and follow the above tutorial. Convert this cross map to a latitude/longitude projection! TADA! Repeat as necessary. Caveat: I can;t test this last step because I use a mac and HDRshop does nor run on a mac. So i can only assume it works. hdrshop: http://www.debevec.org/HDRShop/


madmax_br5 ( ) posted Wed, 12 February 2003 at 12:49 AM

Can anyone tell me if this works? You can just use the sample map above if you want...


Zanny ( ) posted Wed, 12 February 2003 at 12:40 PM

gimmi 5 mins and ill let you know :)


Zanny ( ) posted Wed, 12 February 2003 at 12:47 PM

file_45583.jpg

Nope didnt work :( this is what it shouda happened... from this...


Zanny ( ) posted Wed, 12 February 2003 at 12:51 PM

file_45584.jpg

To this...


Zanny ( ) posted Wed, 12 February 2003 at 12:57 PM

file_45585.jpg

Instead what we got was this... Im sure with a little image rearranging your idea will work


big_hoovie ( ) posted Wed, 12 February 2003 at 2:08 PM

you know there is a bit of diffrerence between the lower cross and the upper one(post wise) the "correct" cross has the cross at the top, rather than the bottom. perhaps if you flipped the cross over, it would work right....


madmax_br5 ( ) posted Wed, 12 February 2003 at 3:10 PM

Oh yeah..i made it upside down...i forgot to flip it back!


madmax_br5 ( ) posted Wed, 12 February 2003 at 3:23 PM

file_45586.jpg

How about this one? I'd love it if you could try again...


Zanny ( ) posted Wed, 12 February 2003 at 3:25 PM

file_45587.jpg

Well a little while later and i managed to come up with my own image using your method :) It is a basic image and please excuse the black line on the balls, when aligning the 6 images it turns out i was out by 1 pixel! anyway it works and with a bit of time and effort this effect could have many uses. Only so much you can do with stock photographs.


Zanny ( ) posted Wed, 12 February 2003 at 4:02 PM

file_45588.jpg

just for you madmax a scene done with your image, it works now :)


TMGraphics ( ) posted Wed, 12 February 2003 at 4:11 PM

Do the 6 images need to be put in a 1000x1000 transparency? Ex.-open a new file in Photoshop and drag the 6 images in, rearrange them, then save it out? Do you have to crop it or anything? BTW - those test look real good!


madmax_br5 ( ) posted Wed, 12 February 2003 at 4:30 PM

Yeah just arrange them in photoshop. No special cropping, just make sure to place them correctly, and that there is no border.


JDWohlever ( ) posted Wed, 12 February 2003 at 4:34 PM

Ok, here is the $65,000 question. What is the POINT? You have already had to make the scene, render it, turn into a HDR, put the HDR image back into the scene. WOuldn't it have been quicker and looked better to have at step one just added the ball to the scene and it would have reflected that scenery anyay? To me its like driving 50 miles out of your way to avoid a left turn.


TMGraphics ( ) posted Wed, 12 February 2003 at 4:45 PM

That way the white value can only be 255 max. A HDR white value can be 10,000 or more. Does make a bit-o-difference


madmax_br5 ( ) posted Wed, 12 February 2003 at 4:46 PM

nahh, the point is you can add photo objects in without having to render them. For example, I could do things normally not possible in a bryce scene, like add lens flares, or even other objects, like balls, cars, planes, robots, anything you want. Ond because you can blur the image, no DOF is needed once in bryce 5!


Zanny ( ) posted Wed, 12 February 2003 at 5:09 PM

Hey JD its been a fun experiement if nothing else :) TM the dimensions for the big image that you put the 6 images into is exactly 3:4. In my example i used 512x512 renders for quickness so the wrap image res was 1536 (3x512) x 2048 (4x512) that way the 6 images fit exactly


Zanny ( ) posted Wed, 12 February 2003 at 5:10 PM

sorry i mean cross image res before conversion


TMGraphics ( ) posted Wed, 12 February 2003 at 7:04 PM

OK, thanks!


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