#Meshres & Distance Blur
7 messages in this thread
Hi Everyone,
I have a couple 3ds/ipas questions.
1. Will meshres allow me to control the complexity of models
at render time? What I thought it would do is allow me
to simplify a very complex model (using optimize) a number
of times so that I'd have say 6 models of varying complexity.
Then I'd somehow embed these 6 models into the original mesh
and select at which frames during my animation they appear.
This way when my complex object is 10 miles away I use the
highly simplified version, when it fills the camera view I switch
to the more complex version.
If this IS how it's meant to work, how do I enter the frames at
which various models are used??
2. Can anyone explain how to achieve what I think is called
a depth of field effect?
I basically want to focus on an object on a tabletop,
with other objects in the background out of focus. Then
I need to focus on the background objects without moving
the camera or adjusting the lighting.
What I'd like is a smooth transition from blur to focus
– a little like distance cue but not only calculated
radially from the camera POV but the ability to focus
on a single object with everything around it blurred.
Can I achieve this with Studio, or does anyone know if it's
being/or has been addressed with IPAS3?
Thanks,
Andy Roberts
BITS Corp.
Andy,
<< 1. What I thought it would do is allow me to simplify a very complex model
(using optimize) a number of times so that I'd have say 6 models of varying
complexity.
Then I'd somehow embed these 6 models into the original mesh and select at
which frames during my animation they appear. This way when my complex object
is 10 miles away I use the highly simplified version, when it fills the camera
view I switch
to the more complex version. If this IS how it's meant to work, how do I enter
the frames at which various models are used??>>
In a sense yes. If I wanted to render the same scene with the 6 embedded
objects and let's say it was a 600 frame animation and I wanted obj1 from 0-99,
obj2 from 100-199, etc, I would call up meshres select obj1, netrender with a
range of 0-99, call meshres select obj2 with a range of 100-199, etc, etc, then
put myself in slave mode and walk away.
<< 2. Can anyone explain how to achieve what I think is called a depth of field
effect? >>
Sure. Use the Yost Group Blur filter. This lets me automatically defocus all or
parts of an image. It works on still images or animations with options
including, blur only above a brightness threshold, "racked focus", and is very
useful for creating multi level defocusing effects and dramatic transitions
within Video Post.
jonas[adesk]
Thanks Jonas,
I'll try that method with meshres.
I'm not sure I'm convinced about the blur filter – I'll take
another look at the documentation for it, but I couldn't see
how to pass a great deal of information to the routine.
If it acts on a brightness threshold, surely I should be
able to specify a "brightness controlled" scene. That way
I could create a copy of my scene with the objects to focus
on being bright – and get it to use that data to blur the
rendered scene. Does this make sense??
Anyway, thanks for the reply – I'm off to check out the manual.
Regards,
Andy Roberts
BITS Corp
Hi Jonas, (gotta' get back to the trial coverage – I'm writing quickly <g>)
<< 2. Can anyone explain how to achieve what I think is called a depth of field
effect? >>
I refer to this question asked of you, as I have been intending to ask this
question for a while:
How difficult would it be to create an IPAS routine to (primarily) use existing
3DS functions to simulate DOF ?
1) by analyzing the scene for TARGET, FOCAL LENGTH, & Objects' distances from
focal plane, etc..
2) by prompting user for F/Stop & perhaps even Shutter Speed.
3) by automatically setting up layered scenes to render, blur appropriately,
and then composite together – perhaps even using Motion Blur to correspond with
and approximate shutter speed.
Of course all of this can be done manually in certain situations, but there is
one problem:
1) Even with a static camera position, if the camera is elevated above a ground
plane, pointing at a point on the GP at less than 180 degrees, you can easily
have the problem of needing to vary blur on a *_single object_* with distance.
This would of course apply to ANY larger/closer objects which would lie in 2 or
more "distance zones".
Is there a way to overcome the above scenario via an IPAS routine, and if so –
do you or anyone else here think implementing a totally automated routine as
outlined above would be useful ? (I do, although most assuredly it would be
computationally expensive)
Thanks for your time.
BILL
Bill, we're going to provide some tools soon that'll allow z-buffer-based DOF
techniques. With a little patience….
– G
<< z-buffer-based DOF techniques. >>
That's good news. Thanks. Is that an IPAS routine, or should I drop this ? <g>
BILL
IPAS.
– G