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Jul 1, 2000, 6:42pm

Subject says it all.

Jul 1, 2000, 6:42pm

....not exactly... elaborate please
_________________________
John Viper
http://www.jtsoft.net <-- Coming Soon!
[View Quote]

Jul 1, 2000, 7:57pm

Wasn't planning on explaining since Roland would know, but here it goes. A
bump map is a picture that creates bumps on models. You know how regular
texture maps are used to create transparency. A bump map is the same type
of file, but instead of changing transparency, it changes the way the light
shows on the object creating the illusion of depth, the picture below is
just a plain sphere, but it has a bump map on it, so it looks like it's more
than a sphere. It has no texture on it, just a plain white sphere with a
bump map.





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end

Jul 1, 2000, 7:58pm

They allow you to create much more complex objects without increasing the
vert/poly count.

Jul 2, 2000, 10:52am

Not really. All bumpmapping is is overlaying an embossed version of the texture over a textured poly. <shrug> Make your own bumpmaps by doing the same in any decent graphics program. <yawn>

[View Quote] > They allow you to create much more complex objects without increasing the
> vert/poly count.

Jul 2, 2000, 12:26pm

well....that is not completely true. With a bump map you get more dynamic lighting and the "edges" of the sphere does look different from an embossed texture.

Aasmund


[View Quote] > Not really. All bumpmapping is is overlaying an embossed version of the texture over a textured poly. <shrug> Make your own bumpmaps by doing the same in any decent graphics program. <yawn>
>
[View Quote]

Jul 2, 2000, 5:27pm

With bump maps all lighting settings apply, like the amount of ambient,
diffuse, etc. The shadows on the bump map also change as you rotate the
object, just as it would if it were made of polygons instead of a bump map.
You "could" do this by making a texture, but it would take a lot of work and
who wants to go through all that trouble when renderware should be able to
do it. Also, bump maps work on textured objects too, so it's not just an
embossed version of the texture, if it was they would always be grey,
couldn't use them on a textured object.

Jul 3, 2000, 9:12am

What part of (unquoted, I might add--learn how to quote, eh?) "overlaying" didn't you understand? The embossed version is OVERLAYED (layered, laid on top of, combined with) the original texture to give the illusion of depth. Try it in any decent graphics editor and see for yourself--same thing. <shrug>

[View Quote] > With bump maps all lighting settings apply, like the amount of ambient,
> diffuse, etc. The shadows on the bump map also change as you rotate the
> object, just as it would if it were made of polygons instead of a bump map.
> You "could" do this by making a texture, but it would take a lot of work and
> who wants to go through all that trouble when renderware should be able to
> do it. Also, bump maps work on textured objects too, so it's not just an
> embossed version of the texture, if it was they would always be grey,
> couldn't use them on a textured object.

Jul 16, 2000, 9:06pm

Although an embossed texture gives a decent impression of 3D, a true bump
map is continuosly rerendered to support scene lighting and pov. A bumped
object (ie. the cracks in a stone wall) will change perspective as you move.

I wouldn't say it's a way to lower polygon count tho. It just makes those
polygons bumpy.

[View Quote]

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