I think depth-shading is the wrong term, but in the tutorial you mentioned I have seen some hints in this direction in the second part.

Greetings Lord Horazont

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@Stucuk: You can visit Paul Bourke's websites for further information.

Using a cubemap was not my idea. You said you cannot get the uv values for the cubemap and I told you how it is calculated on the mentioned website. I told you that it is possible to put your texture without having a singularity on a half sphere calculating the texture coords by yourself. Yes I could find out the algo, but why should I? It was not really funny to help you so far.

Well unfortunatly It doesn't seem to work. I may have implemented it incorrectly:




Yes but i can't find anything useful online. Iv tryed This and this but i can't get eather to work perfect.


I havn't demanded anything, i have only asked how to generate the sphere texture coords as you seem to know. Iv searched and ill continue to search online on how to generate proper texture coordinates. Im not afraid of doing hard work, i just literaly have no clue how the hell you generate sphere coordinates which don't get screwed up at the poles. Which is why i asked in the first post if anyone knew how to generate good tex coords.


If you don't wish to try and help then you don't have to. Thx for trying.

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Free Map Editor - Game Requirements - Stucuk.Net
-Stu

Hallo Stucuk,
from my point of view the following has happened: I took my time taking snapshots and making explanations. These were no short answers to your question, alltogether it sure lasted at least one hour or more. And what did I get? Only a .... I don't like to be teased.

Yes I know how to do such things because i am writing a modeller and the part of assigning textures planar, cylindrical and spherical is already finished. It is only a hobby project and I do it because I want to know how things really work. Therefore I do it the hard way: no glu-code allowed, no glTranslate/Rotate/Scale only self made matrices etc.

Concerning the cube map: If I would need a sky I would take a sphere too because you do not need six textures or a panoramic view with special texture coordinates or such things. One texture is enough and that is important if you want to use the texture matrix, for example. It makes everything much easier.

If you are patient enough to wait until tomorrow morning I setup a small windows program where the code concentrates on the interesting things. I make it just the other way round the guy in this article did: I start from the sphere vertex, shoot it on a plane and then shift and scale it to texture space. There is no singularity on the top because in this case the texture is not wrapped around the sphere but put ON the half sphere like a blanket.

Note: you mentioned you want to have it proper. This needs a better definition. You are putting a plane onto a sphere. that means, you will never get it "proper", because stretching cannot be avoided, only be made less ugly.

By the way, there is no reason why the code of the article should not work. If you want me to, I take the code of this article and the cube map. But I would take only one texture for all six sides.

It takes a little bit because all the necessary code is core modellercode and I have to draw it out and arrange it new for you. I cannot do that before evening - a nice saturday night's work. Will I get another ...?
Traude

Didn't mean to make it sound as if i was teasing.


That would be great, thanks.



By proper i mean so that if you set it up in a FPS game that it would look to the player like a sky with no apparent anomolies which jump out at you (Your blanket method looks good).


Could be that im implementing it wrongly, Tho with normal cube texture coordinates i don't see how you can get 1 texture to be properly displayed on a "CubeSphere" as it is displaying 1 texture(0,0 -> 1,1) for each of the 6 cube face's rather than 1 texture over the whole object.


Nope you get a . I am extremely greatful to everyone that replys.

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Free Map Editor - Game Requirements - Stucuk.Net
-Stu

Hallo Stucuk,
Sorry that I'm late but I had to struggle a little bit with glFrustum (I always struggle with glFrustum, whenever I get my hands on it).

I add below a delphi example program that uses a "skydome", a magnificant name for a really simple inner half sphere with texture coordinates that have no singularity at the top. It is "standing" on the X/Z plane. I hope I succeded in making the code understandable.

My modeller code was not suitable because it uses the classic way of creating sphere tex coords. It is also not recommendable to just orthogonal project the vertices to the X/Z-plane, because the texture would "brake down" at the margin of the half sphere, as someone somewhere mentioned. So I changed the method of calculating the tex coords a little bit (for details see code). But I want to point out that this is neither the best nor the only way of getting good sphere tex coords. There is plenty of space for improvement (making the dome a little bit flatter, reducing distortion, ...)

You need dglOpenGL.pas and glBitmap.pas for compilation.

*** Use the mousewheel to go up and down in the dome (the dome is rotating)
*** Press the "Toggle"-button to change between looking up/looking forward
*** If you want to change the texture: take a look into TestFormUnit.pas, line 89.
Traude

Thanks. Iv replaced the dome in the dynamic clouds demo with your one (and given credit in readme + SkyDome unit). It seems to work perfectly (I can't find any anomolies anyway).

- Download ~327KB

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Free Map Editor - Game Requirements - Stucuk.Net
-Stu