Description:
This sample shows how to go beyond the limits of the Model
class that comes built in to the XNA Framework, by loading geometry data into a
custom class that can be extended more easily to cope with specialized
requirements.
Sample Overview
The Model class
that comes built into the XNA Framework provides a convenient way to load and
display graphics, but it's not very flexible. Model can be extended in a limited manner by attaching custom
data to the Tag property
(in fact, many other samples such as the Skinned Model Sample and Picking with
Triangle-Accuracy do just that), but beyond a certain point, trying to
cajole Model into handling
scenarios that it was never designed for can become more trouble than it's
worth.
Fortunately, the layered design of the Content Pipeline
makes it easy to replace Model with
a custom (and hence more easily extensible) alternative. There's no need to
alter the importer behavior, so our custom model replacement can still import
data from standard file formats such as .X or .FBX. This sample implements
a CustomModel class, along
with a CustomModelProcessor that
extracts the necessary geometry data from the NodeContent format that was output by the importer.
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