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 Introduction |
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In this tutorial,
we'll be rendering a Clip Map to be used in a compositor.
This tutorial
requires:
Pixels3D
| studio | v3.x
A
2D Compositing Application ( After Effects, effect*, Flame,
etc... )
An
understanding of techniques explained in previous PIU tutorials.
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| Downloads |
| The
Plan |
| Using the included
background plate of a shed, we'll create a clip map that will
allow a 3D corkscrew to pass through the hole in the wall. |
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| Open
the Sample Scene |
| The Sample Scene
consists of a pre-animated corkscrew passing through a mesh. This
mesh will represent the wall of the shed. |
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| Import
the Background Plate |
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Open the View Options for the Camera Pane by clicking the button
labeled 'Camera' in the upper-left of the camera pane.
Click the Image CheckBox, and click the 'No Image Loaded' swatch
to open the Texture Manager.
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| Click Apply
to return to the Camera View Options, then click OK. |
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| The image appears
as the backdrop in the Camera View. |
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| The
'Fun' Part: Matching the POV |
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Only by carefully tweaking the camera/interest position, field
of view, and roll, are we able to match up the view with the
image. The only way to learn this by doing it, so play with
it for awhile & see if you can line up the mesh with the
wall.
If you get can't get it to look right, check the Corkscrew
Aligned file for a solution.
In this case, the match does not need to be perfect, as thi
clipping plane will only be used to matte out the parts of the
corkscrew behind the wall.
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| Setting
up Shaders |
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Load in the MatteBlack & MatteWhite Shaders.
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Apply the MatteBlack Shader to the Clipping Mesh.
Apply the MatteWhite Shader to the Corkscrew.
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A Quick Render reveals our Luma Matte.
At this point, render the entire animation with AntiAliasing
set to 2:1. This produces a matte without jaggies.
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| Render
the Diffuse Pass |
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To keep the clip matte file in-tact, do a File>Save As,
and use a new name. This file will be the diffuse pass.
The clipping mesh is no longer needed, so delete (or hide)
it.
Apply a metal shader to the Corkscrew.
Now, render out this file.
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| Composite
the Elements |
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Import the Diffuse Pass, Matte Pass, and Background Plate into
the compositor.
On the right is the layer setup for use in Adobe After Effects.
The matterender layer ( the Clip Map ) has been selected as
a Luma matte for the diffuserender layer.
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| Render
from the Compositor |
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As you can see, many times, Pixels can do the work for you.
Just imagine how difficult this would have been to manually
roto!
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