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Welcome to Fractal Forums > Fractal Software > 3D Fractal Generation > Mandelbulb 3d > background sphere
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Author Topic: background sphere  (Read 2155 times)
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metalion
Forums Freshman
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Posts: 10
« on: February 01, 2014, 05:11:52 AM »
I learned how to make a panoramic sky so I could project it as a background sphere, but when I apply it it loses clarity
get all blurry and big looking. How can I get it to look clear with a nice resolution? Im guessing its getting stretched out.
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metalion
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Posts: 10
« Reply #1 on: February 02, 2014, 11:34:14 PM »
? is this just a problem that can't be fixed? Ive seen some videos that had spectacular backgrounds so, Im just wondering if that was done with after effects or something.
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Madman
Fractal Molossus
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Posts: 678
« Reply #2 on: February 03, 2014, 08:50:33 PM »
Can you post the parameters and attach a small size example of your background to your post?
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All I want is a warm bed, a kind word and unlimited power (Ashleigh Brilliant)
metalion
Forums Freshman
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Posts: 10
« Reply #3 on: February 04, 2014, 04:00:02 AM »
Mandelbulb3Dv18{
b.....E/....1...w....2....UEHjicvvO..XYgefqLc61EOcB6K8XnFzXNsFo.ahMhz62nn79f10xj
................................tNFDWSJayz1........Y.//.................y.2...wD
...Uz.....U0..../M.0/......j....M5....E3.....AYgqmbYGmoD/.......Cfe8/dkpXm1.NEbq
y.....kD12../..........wz..................................u1....y1...sD...../..
.z1...sDr1pzEicP5x9wRTh7aoACzKRSTI3AEJnjdP9tYquCmwvmhJ.sZsJGzMR1Akedm9njPboLJkK7
vwnSV/SuHcL6zeCx1GTc0Xoj......Y9..............sD/6....sD..E.....................
.............oAnAt1...sD....z.rbu3.2UeL.k0eS/.Jcu3.wVeL.E8eS/.ncu3......k....k1.
.....AQxcz1.......kz..Ak.1UV..4.P....E4...kG....m....c3....F....6/...I1.....Sl52
...ZdpFG9yzb2zzzRYoWzz7lzn3A3c..zzD...EbG7eFT5uD4Eot8VlJ4z9..0.......2.28.kFrA0.
.Ub96aAIVz9.1se7Umvxz0........../EU0.wzzz1...........s/...................E.2c..
zzzz.............0...................2./8.kzzzD...........U4....................
/EU0.wzzz1........................................kzzzjvee0.....zzzzbHJJ.....wzz
zvBmx/....kzzzjvQs5.....zzzzi1bT.....wzzzvCly/....kzzzjvMw5.....zzzzinqT.....wzz
zvCkz/....kzzzjv..EsUa3feeWCNqGQIJ36wk8EwyLsUa3fn/5OZ7LNls0QiR4.17rPrFKNYpWHZZqN
E....2....E.....I....c.....GVlaNDB4R7NoI.A5...............................U/4MU/
4M........UaNaNaNaNxzoAnAnAnA1yD...................wz...........................
................................................................................
........................}

I cant get the photo to upload, due to 256K limit, kinda small how are people uploading pictures to this forum?
if you email me I could send it to you that way.
« Last Edit: February 04, 2014, 04:04:43 AM by metalion, Reason: edit add » Logged
metalion
Forums Freshman
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Posts: 10
« Reply #4 on: February 04, 2014, 04:12:11 AM »
Here I sized it down and converted it to jpg, original size I had it at was 2000X1000 png file.
Dont know if this helps.
Thanks.
TT

* smallpic1.jpg (237.13 KB, 1000x500 - viewed 471 times.)
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metalion
Forums Freshman
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Posts: 10
« Reply #5 on: February 04, 2014, 04:14:12 AM »
This is what im seeing when its rendered in the scene.

* reflections.jpg (133.56 KB, 1280x768 - viewed 272 times.)
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Madman
Fractal Molossus
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Posts: 678
« Reply #6 on: February 06, 2014, 09:39:03 PM »
Hmm, seem to me, your background is not distorted at all. You've got that technique pretty well under control (better than me grin). But if your trying to span a 2k X 1k picture over a sphere and only look at a very small part of that sphere at a 1280 X 768 resolution, you will never get a detailed background. You may want to think about a background file size of 20k X 10k (or if that's not achievable, a resolution as high as possible) and rerender. Furthermore, your parameters show that you have added some fog in the lighting tab. If you want a crisp background, you should reduce that to 0.
« Last Edit: February 06, 2014, 09:53:21 PM by Madman » Logged
All I want is a warm bed, a kind word and unlimited power (Ashleigh Brilliant)
metalion
Forums Freshman
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Posts: 10
« Reply #7 on: February 07, 2014, 04:48:48 AM »
Thanks I think I got it figured out now.learned a few new tricks this week.
 cheesy
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JohnVV
Conqueror
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Posts: 123


having fun
« Reply #8 on: February 09, 2014, 07:35:40 AM »
i do a lot of map work ( make planet and moon maps of the solar system) and mapping to a sphere is different than to a cylinder
http://en.wikipedia.org/wiki/Map_projection#Cylindrical
the poles are stretched
http://en.wikipedia.org/wiki/List_of_map_projections
this is the MOST common in 3d rendering ( besides using a CubeMap)
http://en.wikipedia.org/wiki/Equirectangular_projection


for a sphere a "Simple Cylindrical " map projection is needed

OR
use a "cube map" ( AKA "sky box")
http://en.wikipedia.org/wiki/Cube_mapping



most of the time there is no real good way to remap a photo ( like a panorama ) to a SPHERE .To a cylinder -- YES but a sphere has different geometry .

there are some programs like
"Mathews Map Projection"( MMPS)
http://www.users.globalnet.co.uk/~arcus/mmps/

or
likely the best way is to use "The Gimp" and use the "to polar" distort then using the HEAL tool to "FIX" it at the poles.
 
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