Re: normal and bump maps together

["Arvid Björn" <arvidbjorn(at)gmail.com>]

Hi list!

I dug up this post from the beginning of time after searching my mail archive, just wanted to ask a question about this. Combining maps this way seems to create like a 50% mix of each, which decreases the effect of both normal map and bump, and I'm not sure how to boost the normal map. Is there any "proper" way of combining normal + bump? :-)

Thanks,
Arvid

On Mar 13, 2007 3:24 PM, Bernard Lebel <3dbernard(at)gmail.com> wrote:

> What are the benefits if any of using normal maps instead of bumps.

Much faster to render, greater access to the illumination of the
object, can be automatically setup for viewport display with realtime
shaders through Ultimapper.

> and is there a way to combine hight or depth maps (bump maps) with
> normal maps?

If the normal is a tangent space normal map (mostly blue), plug the
normal map into a XSINormalMap, and combine the bumpmap_generator with
the xsinormalmap with a vector_math_vector using vector1+vector2
operation. Since a bump is expressed in object space normals, it is
simple to convert the normal map into object space normals as well
(this is what the xsinormalmap does).

If the normal map is not a tangent space normal map but rather an
object space normal map, convert it to vector, make sure its range is
-1/1, and plug it into a vector_math_vector using the same operation I
previously mentioned.


Cheers
Bernard

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