Re: Non-Photorealistic Rendering 2005-06-12 - By Harvey White
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On Mon, 13 Jun 2005 00:48:44 -0000, you wrote:
>--- In Carrara@(protected), Harvey White <madyn@(protected)> wrote:
>> On Sun, 12 Jun 2005 23:43:48 -0000, you wrote:
>>
>> >Hullo All,
>> >
>> >I've just tried to use a preset for the NPR and Carrara 4 Pro tells me that
I have not
>installed
>> >the Wizard. Scene wizard seems to work for setting up so I don't understand
what I've
>done
>> >wrong when it comes to rendering. I upgraded and my Carrara 3 folder is
full of stuff
>that the
>> >installer didn't think fit to put into my Carrara 4 folder (I tried moving
them over but
>that's no
>> >good).
>> >
>> >All of which brings me to my main point. Does anyone know how to use the
outlines
>option
>> >in the NPR so that, when the camera is close to an object it DOESN'T render
outlines
>for the
>> >back of the object? At first I thought I had backfaces turned on at the
object level, but
>no.
>> >The effect is only apparent when the camera is really close.
>> >
>> >I'm trying to end the animation by moving so close into an object that the
screen goes
>blank,
>> >I can't do this because it keeps showing the outines of the far side of the
object.
>> >
>> >I'll see if I can upload the QT movie to the FIles section of this Group,
called NPR or
>similar.
>> >
>> >Any and all suggestions greatfully received.
>>
>> I don't know about NPR, but one thing to consider is that in Carrara,
>> unless the object is specifically a volumetric object, all objects are
>> simply shells of zero thickness. You can go directly into a sphere
>> from the outside, and once inside, you will see the shader (unless
>> you've taken steps to prevent this) that's on the outside.
>>
>> This might be one of your problems. Another possibility for you to
>> try is to work around this, stopping a fraction short of the object,
>> then editing in a direct cut to black (video editing program). This
>> would work as well, I think.
>>
>> Harvey
>>
>Thanks for the idea Harvey, but by the time I'm close enough to be clear of
any other
>objects, the back faces are already visible (file NPR.mov is uploaded now).
I think we may be talking two different situations here. As you go
towards an object, if the hotpoint (or center, often the same) of the
camera goes through the object, you see the backfaces of the object
because you've gone through the object's "wall".
One thing to do here is to very subtlely zoom in on the object as you
move towards it, so that the object fills the entire screen. At that
point, you can go to black. Perhaps a bit tricky, but that can work.
The faster you do this, of course, the better.
>I may have to
>find some way around it, but I'm a bit disappointed that I keep finding odd
limitations in
>this, otherwise excellent, programme. Do you think putting some other kind of
object in
>the way may help? Can I specify a volumetric object?
Several things to consider: one is that there are limitations to
every program, 3DS, Maya, lightwave, etc. The questions are basically
can the limitations be worked around, and also will they stay?
If the situation is as I imagine it, then this is not a function of
NPR, but simply the geometry of the object, as seen by carrara. The
"fix" is that all objects need to be volumetric, which is unlikely.
Putting an object in the way, since it will be one or two objects that
are effectively planar, will not help if the objects are not
volumetric.
However, a volumetric object, such as a cloud (you need zero falloff
at the edges and spheric or hemispheric - positioned accordingly)
would work for you. The trick is that the cloud must be dense enough
to obscure the insides of the object. If you are seeing the insides
of the object and other, surrounding objects, then I'd suggest the
simultaneous zoom with camera movement. The reason is that the cloud
would only obscure the area that it is "within", which is its
container....
Harvey
>
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