3DPrint: Difference between revisions

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(How to 3D Print)
 
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1) Export scene to .obj format per https://www.cohtitan.com/forum/index.php/topic,4947.0.html
1) Export scene to .obj format per https://www.cohtitan.com/forum/index.php/topic,4947.0.html
From DrBoston
Import file to Blender
Delete everything but costume
● Z toggles wireframe view
● Numpad 5 toggles between perspective and orthogonal view
● Numpad 7 changes to top view
● Shift-B allows for box selection
● Ctrl-I selects inverse
● X deletes
● Be sure to delete chest emblems and aura objects
Position costume upright and at the origin
● Numpad 1 moves to front view
● Numpad 3 moves to right view
● A selects (or deselects) all
● Object > Transform > Origin to Geometry moves each selected object’s origin to its center - do this for all parts
● G grabs (moves)
● R rotates
● Use X, Y or Z button after G or R to limit movement to one axis
Clean up costume
Remove double vertices
● Tab key toggles Edit mode
● A selects (or deselects) all
● Click “Remove Doubles” from left tool bar or choose Mesh > Vertex > Remove Doubles
Recalculate normals outside
● Ctrl-N or Mesh > Normals > Recalculate Outside
Add subdivision surface modifier
● Tab to toggle out of Edit mode
● Click wrench icon in Properties window in right to bring up modifiers
● Click Add Modifier and choose Subdivision surface
● Set to Catmull-Clark method with 3 subdivisions for View and Render
Clean up any special geometry
If planning to use color or displacement textures, do not add or remove vertices, edges nor faces.
Edged Parts (example: glove fin, belt ampules)
● Toggle into Edit mode
● Chose Edge-select at bottom
● Right click the edge in question, Shift-right click to select multiple. Currently active selected edge will be in white, other selected edges will be in orange.
● Shift-E or Mesh > Edges > Edge Crease to set edge crease. Creases can be set between 0 (no crease) to 1 (hard edge). I find .25, .5 and .75 the most useful. Edges will get darker and then more and more magenta as their crease value increases.
● The same technique can be used to decrease the thinning caused by subdivision surface
Single-plane pieces (example: visor)
Select the single plane piece.
Ctrl-L will select all connected vertices to the currently highlighted ones
P > Selection will split off selected vertices into their own object
● On the new object, set a Solidify modifier.
Edge creases can be used to add additional embellishments
Skirts
● These often have an inner layer of vertices that cause issues for subdivision surfaces.
● Split out skirts and capes as their own objects using P > Selection, make them a single surface and then add a solidify modifier
Transparent textures (ex: Ghost Widow hair, tattered cape)
Address obvious geometry issues
Belt ampules - these didn’t intersect with the belt after subdivision surface
I made them thicker by selecting the edge loops (the magenta ones), setting pivot point to Individual Origins and making then using S (scale).
Scale objects
● In object mode, select all and apply Location, Rotation and Scale
● S for scale to appropriate factor (x15.24 will scale OBJ in feet to 1:20 scale in mm)
● Apply Location, Rotation and Scale again
● Verify all your solidifies are at a thickness of material's minimum or greater wall thickness (0.3 for frosted ultra detail, 0.7 for strong & flexible plastic, 2 for sandstone)
Save file
Export to X3D
Repair mesh
Upload to Shapeways
Check for thin places
Correct thin places
Thin walls
Thin pointy tips
Thin organic shapes
Options for WRL or MAX files
Add color textures
Save base TIFs as color / diffuse maps in PNG format
Fix smears or other mapping issues
Add displacement textures
Add color first
Save alpha layer of bump TIFs as displacement maps in PNG format
Add simple subdivision surface modifier
Add displaceme modifier
Rig & Pose
Apply Rigify rig: https://www.youtube.com/watch?v=dYiAd_08-0k
Save to not-to-be-touched version
Pose
Save as new file for posing
Hollow model
Save as solid original
Save as hollowed / shell copy
Export
If using displacement maps, remove second (simple) subdivision surface modifier
Calculate shell
Set Accuracy based on size of model and what memory will support - 0.4 mm is an OK starting point
Set Shell thickness to Accuracy + material’s minimum wall thickness
Set Smoothen result to false
Import shell
Add escape holes
Set up hollowed model
Export and upload to Shapeways

Revision as of 20:32, 1 June 2019

1) Export scene to .obj format per https://www.cohtitan.com/forum/index.php/topic,4947.0.html

From DrBoston Import file to Blender


Delete everything but costume ● Z toggles wireframe view ● Numpad 5 toggles between perspective and orthogonal view ● Numpad 7 changes to top view ● Shift-B allows for box selection ● Ctrl-I selects inverse ● X deletes ● Be sure to delete chest emblems and aura objects

Position costume upright and at the origin ● Numpad 1 moves to front view ● Numpad 3 moves to right view ● A selects (or deselects) all ● Object > Transform > Origin to Geometry moves each selected object’s origin to its center - do this for all parts ● G grabs (moves) ● R rotates ● Use X, Y or Z button after G or R to limit movement to one axis



Clean up costume Remove double vertices ● Tab key toggles Edit mode ● A selects (or deselects) all ● Click “Remove Doubles” from left tool bar or choose Mesh > Vertex > Remove Doubles



Recalculate normals outside ● Ctrl-N or Mesh > Normals > Recalculate Outside


Add subdivision surface modifier ● Tab to toggle out of Edit mode ● Click wrench icon in Properties window in right to bring up modifiers

● Click Add Modifier and choose Subdivision surface

● Set to Catmull-Clark method with 3 subdivisions for View and Render

Clean up any special geometry If planning to use color or displacement textures, do not add or remove vertices, edges nor faces. Edged Parts (example: glove fin, belt ampules) ● Toggle into Edit mode ● Chose Edge-select at bottom

● Right click the edge in question, Shift-right click to select multiple. Currently active selected edge will be in white, other selected edges will be in orange.

● Shift-E or Mesh > Edges > Edge Crease to set edge crease. Creases can be set between 0 (no crease) to 1 (hard edge). I find .25, .5 and .75 the most useful. Edges will get darker and then more and more magenta as their crease value increases.


● The same technique can be used to decrease the thinning caused by subdivision surface


Single-plane pieces (example: visor) Select the single plane piece. Ctrl-L will select all connected vertices to the currently highlighted ones P > Selection will split off selected vertices into their own object

● On the new object, set a Solidify modifier.



Edge creases can be used to add additional embellishments

Skirts ● These often have an inner layer of vertices that cause issues for subdivision surfaces. ● Split out skirts and capes as their own objects using P > Selection, make them a single surface and then add a solidify modifier

Transparent textures (ex: Ghost Widow hair, tattered cape) Address obvious geometry issues Belt ampules - these didn’t intersect with the belt after subdivision surface

I made them thicker by selecting the edge loops (the magenta ones), setting pivot point to Individual Origins and making then using S (scale).


Scale objects ● In object mode, select all and apply Location, Rotation and Scale

● S for scale to appropriate factor (x15.24 will scale OBJ in feet to 1:20 scale in mm) ● Apply Location, Rotation and Scale again ● Verify all your solidifies are at a thickness of material's minimum or greater wall thickness (0.3 for frosted ultra detail, 0.7 for strong & flexible plastic, 2 for sandstone) Save file Export to X3D Repair mesh

Upload to Shapeways

Check for thin places

Correct thin places Thin walls

Thin pointy tips

Thin organic shapes

Options for WRL or MAX files Add color textures Save base TIFs as color / diffuse maps in PNG format Fix smears or other mapping issues Add displacement textures Add color first Save alpha layer of bump TIFs as displacement maps in PNG format Add simple subdivision surface modifier Add displaceme modifier

Rig & Pose Apply Rigify rig: https://www.youtube.com/watch?v=dYiAd_08-0k Save to not-to-be-touched version Pose Save as new file for posing Hollow model Save as solid original Save as hollowed / shell copy Export If using displacement maps, remove second (simple) subdivision surface modifier Calculate shell Set Accuracy based on size of model and what memory will support - 0.4 mm is an OK starting point Set Shell thickness to Accuracy + material’s minimum wall thickness Set Smoothen result to false

Import shell Add escape holes Set up hollowed model Export and upload to Shapeways