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Motivation
- STEP fjles are the default 3D interchange
2 1 3 4 5 6 7 8 Redundant! *
STEP Reduce Seth Hillbrand KiCad Services Corp. 1 / 13 Motivation - - PowerPoint PPT Presentation
STEP Reduce Seth Hillbrand KiCad Services Corp. 1 / 13 Motivation - - PowerPoint PPT Presentation
STEP Reduce Seth Hillbrand KiCad Services Corp. 1 / 13 Motivation STEP fjles are the default 3D interchange 1 2 3 4 Redundant! * 5 6 7 8 2 / 13 Large 3D libraries KiCad provides a comprehensive 3d library In exchange for a
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Large 3D libraries
- KiCad provides a comprehensive 3d library
– In exchange for a mere 5.8GB
- DIPTrace (commercial) 3d library
– 4.7GB
- Manufacturer models
– High Density → T
- o large to e-mail
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Content Redundancy
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After Reduction
- No repeated
commands
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Example result
- QFN-68 from DIPTrace 3d model library
- QFN-68 from KiCad 3d model library
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What about STPZ?
- STPZ is great… BUT
– Layers zlib on STEP
fjles
– Window context compression
- Hufgman windows only deal with fjrst order
representation difgs
- DIFFERENT COMPRESSION METHODS
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Combine STEPZ/STEPReduce
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3D comparison
- Compression doesn’t matter if the model is
not accurate
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3D comparison
- Compression doesn’t matter if the model is
not accurate
- OpenCascade allows for easy, binary
verifjcation
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3D comparison
- Compression doesn’t matter if the model is
not accurate
- OpenCascade allows for easy, binary
verifjcation
Gives NULL result to within face- level FUZZY setting
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Net Reduction
- KiCad STEP library
– STEP Reduce + STPZ – 5.8GB → 1.50GB
- Critically, 60+MB, full board 3d model
reduces to 12MB → Fits through most mail servers!
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Questions?
- Try it out yourself: