Rethinking the Computer Enhanced Design Process

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Ecotect

• Import for Thermal
• very specific in it's requirements about spatial
  information
• 3D geometry can be mostly created in ECOTECT
• do not import a full 3D CAD model from another
  program
• use existing 2D drawings to trace over in ECOTECT

• Import for Solar Lighting
• quite detailed 3D geometry is required
• ECOTECT needs to know less about the building
  than for a thermal analysis
• it is reasonable to import full 3D geometry
• specify the materials of all surfaces correctly
  in order for reflected and transparent objects to
  be accurately considered

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Importing CAD data
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Importing

• DXF import

• 3DS or STL import

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DXF

• Drawing Interchange Format (DXF)
• 2D and 3D information
• either ASCII or binary formats
• simple geometric description
• 3DS
• 3D information
• complex geometry

• STL
• 3D solids only
• faceted surfaces only
• (exporting to STL will automatically triangulate
  any curved surfaces)

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MicroStation

• http//www.bentley.com/
• en-US/Markets/Building/
• OpenStandardsandInteroperability.htm
• Supports
• DXF
• STL

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FormZ

• http//www.formz.com/
• products/formz/import_export.html
• Supports
• 3DStudio
• DXF
• STL

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ArchiCAD

• http//www.graphisoft.com/
• products/archicad/interoperability/
• Supports
• DXF

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AutoCAD

• http//usa.autodesk.com/
• adsk/servlet/ps/item?id2862074linkID2475874sit
  eID123112
• Supports
• 3DStudio
• DXF
• STL

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AutoCAD

• Save drawing to DXF file format
• http//usa.autodesk.com/
• adsk/servlet/ps/item?id2890812
• linkID4198944siteID123112
• Exporting a 3DS file
• http//usa.autodesk.com/
• adsk/servlet/ps/item?id2896690
• linkID2475323siteID123112
• Exporting an STL file
• http//usa.autodesk.com/
• adsk/servlet/ps/item?id2896893
• linkID2475323siteID123112
• Setting the accuracy for exporting STL files
• http//usa.autodesk.com/
• adsk/servlet/ps/item?id2877708
• linkID4183228siteID123112

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Exporting from CAD programs

• It is important to remember that
• DXF 3DS file formats can be written differently
  by different CAD programs,
• different results may occur depending on the
  program and it's export settings.

• If the desired result is not achieved in ECOTECT
  it is recommended that you attempt all the
  options available when exporting from your CAD
  package, as significantly different results can
  be achieved with different settings.

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DXF

• Drawing Interchange Format (DXF)
• 2D and 3D information
• either ASCII or binary formats
• simple geometric description
• tagged data representation
• group code (e.g. 2)
• data value (e.g. ENTITIES)
• group code indicates what type of data element
  follows

• 2
• ENTITIES
• 0
• LWPOLYLINE
• 5
• C4
• 100
• AcDbEntity
• 8
• 0
• 370
• -3
• 6
• Continuous
• 62
• 3

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DXF

• A DXF file is split into a number of SECTIONS
• 0
• SECTION
• 0
• ENDSEC
• 0
• SECTION
• 0
• ENDSEC
• EOF

• The SECTIONS are as follows
• HEADER
• CLASSES
• TABLES
• BLOCKS
• ENTITIES
• OBJECTS
• THUMBNAILIMAGE
• 0
• SECTION
• 2
• ENTITIES
• 0
• ENDSEC

more stuff goes here
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DXF

• The ENTITIES section can contain a number of
  different entities

•   3DFACE   3DSOLID   ACAD_PROXY_ENTITY   ARC
    ARCALIGNEDTEXT   ATTDEF   ATTRIB   BODY
    CIRCLE   DIMENSION   IMAGE   INSERT
    LEADER   LINE   LWPOLYLINE   MLINE   MTEXT
    OLEFRAME   OLE2FRAME   POINT   POLYLINE
    - Polyface Meshes   RAY   REGION   RTEXT
    SEQEND   SHAPE   SOLID   SPLINE   TEXT
    TOLERANCE   TRACE   VERTEX   VIEWPORT
    WIPEOUT   XLINE

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DXF

• LINE, CIRCLE, ARC, ELLIPSE
• Basic 2D lines and curves
• LWPOLYLINE
• 2D line with many vertices
• SOLID
• 2D face with 3 or 4 vertices
• SHAPE
• 2D regular shape (e.g. square, hexagon, etc)

• 3DSOLID
• A regular solid (e.g. cone, sphere, cylinder,
  etc) encoded in a proprietary format
• 3DFACE
• 3D face with 3 or 4 vertices
• POLYLINE
• 3D line consisting of one or more connected
  straight line segments
• Closed or open
• POLYFACE MESH
• 3D faceted surface that can have holes
• facets can have 3 or 4 vertices
• a sequence of vertex entities
• faces that compose the mesh

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Importing 3DSOLID
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Importing

• General procedure
• Draw spatial volumes in CAD program
• Convert mode to appropriate representation in CAD
  program
• Export to either DXF, 3DS, or STL
• Import into Ecotect
• Assign materials
• Create window links

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Solid modelling vs. Surface modelling

• In the CAD program, there are two options
• Solid modelling
• Surface modelling

• Solid modelling
• Create the volume of the room using solid
  modelling tools
• Convert the solid model to a surface model
• Convert any curved surfaces into faceted surfaces
• Export
• Surface modelling
• Define the volume of the room using surface
  modelling tools
• Convert any curved surfaces into faceted surfaces
• Export

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Solid modelling vs. Surface modelling

• Solid modelling
• Advantage the room volume is automatically
  closed
• Disadvantage the modelling tools are less
  flexible
• Surface modelling
• Advantage flexible modelling tools
• Disadvantage you have to ensure that the room
  volume is airtight

• Solid modelling
• Create the volume of the room using solid
  modelling tools
• Convert the solid model to a surface model
• Convert any curved surfaces into faceted surfaces
• Export
• Surface modelling
• Define the volume of the room using surface
  modelling tools
• Convert any curved surfaces into faceted surfaces
• Export

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Importing box

• MicroStation example

mesh
import
shape
MESH
3DFACE
complex shape
LWPOLYLINE
MicroStation
Ecotect
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Importing curved volumes
MESH
mesh
3DFACE
import
shape
LWPOLYLINE
complex shape
MicroStation
Ecotect
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Creating windows

• Create your window after it is imported

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Creating windows

• Create the window in CAD app

import
MicroStation
Ecotect
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Importing surface

• MicroStation example

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Importing surface with windows

• MicroStation example

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