CS 294-3: RAPID PROTOTYPING
Lecture #11 -- Nov. 17, 2000.
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Discussion of the Designs for the ZCorp 3D Printer
Discussion of Plans for Course Projects
An Introduction to VRML
- It is B-rep with shared vertices.
-- in the same conceptual framework as Berkeley UniGrafix and SGI's Inventor.
- Jane Yen has written a format converter from SLIDE -- THANKS !
- for an example see: A VRML file for 3D printing
For each piece of surface generated in SLIDE, you will find:
-- some header info specifying the color,
-- a list of indices (in groups of 3, terminated with a "-1") that specify the connectivity of a triangle mesh.
-- a list of floating point triplets that specify the vertex coordinates, implicitly matching above index numbers.
-- a list of floating point triplets that specify the face normals -- seems to get ignored.
Hints in Preparing Files for the ZCorp 3D Printer
As we try to run the various designed parts, we are learning several things:
- The software for assembling multiple parts into one run is incredibly primitive.
- The assumed default units are milli-meters, but can be switched to inches.
- The default coordinate system is left-handed, but can be switched.
- The build volume is 225mm in x (to the right), 150mm in y (towards the user), and 150mm in z (upwards).
Thus all parts should be built in an orientation that minimizes z-height.
- Multiple parts should be assembled to fill the platform (230x150) as much as possible
while keeping the build height low and as uniform as possible.
- If a user, or a team of users have several (similar) parts to build,
it helps a lot, if the parts are properly scaled and pre-arranged before they are converted to VRML.
Homework Assignments:
A#11: DUE before Thanksgiving
Please resubmit your webCAD designs again.
The CyberCut team reports that they have fixed several of the discovered problems
and made the whole pipeline more robust.
Please give the system another try and report back your experiences to me and to:
pwright@robocop.me, ahn@kingkong.me, vsundar@kingkong.me, ashish@kingkong.me, roshan@kingkong.me
NEW A#12: DUE in Next Class, Dec. 1, 2000
Prepare a formal 6-minute per person presentation
of your course project, i.e., your demonstration "show-piece".
Give a description of your object and of your design approach;
show preliminary sketches or test structures.
The use of foils and computer projection is encouraged.
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