Our first lesson was an introduction to modelling with NURBS:
Most of the 3D modelling I've done previously has been with polygons. The only NURBS modelling I've done before was to model some iron railings in a mostly polygon-created town environment:
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simple railings made with NURBS |
Here are a few of the basic techniques we learnt (This may seem like detailed blogging but it also acts as a reference/guide for me to look back at if I forget how to do something):
Creating a wall:
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Using the CV Curve Tool draw out line shape (hold 'shift' to snap into a straight line) |
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Once line is drawn, press 'enter' to complete |
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'Ctrl + D' to duplicate and move across |
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Select both lines and 'Loft' to create the wall |
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To add more detail to the wall it needs more points to select and manipulate; to do this first Right click and select 'Isoparm' |
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Hold 'shift' and drag new isoparms down - however many needed from each side |
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To turn the yellow dotted isoparms into solid green lines, select 'Insert Isoparms' |
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Can then Right click and select 'Control Vertex' to manipulate points on the wall |
Create a pipe/wire:
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Create a curved shaped using CV Curve Tool |
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Press 'enter' to finish drawing the curve |
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Create a NURBS Circle |
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Select the 'Move Tool' for the circle. Hold 'C' and middle mouse click on the curve to snap the circle to it |
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Drag circle to the end of the curve and rotate to roughly 90 degrees to the curve |
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With the circle selected, 'shift' click the curve and go to the 'Surfaces' menu and click the option box next to 'Extrude' |
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Make sure 'Path Direction' is highlighted next to 'Orientation' and then 'Apply' or 'Extrude' to create the pipe/wire object |
Create a square from a NURBS circle:
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This shape was made by moving and scaling vertex points. |
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Duplicate and scale down, 'loft' between both of the squares |
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To "close end" just scale smaller curve down until it is too small to see |
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The finished shape |
I found another way - don't know if this is a good way to create a square from a circle but I guess I'll find that out once I start my NURBS modelling, by creating a 4-point circle with Linear Degree as highlighted in image (below)
Revolve:
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Use CV Curve Tool to draw out shape |
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'Center Pivot', then press 'insert' and hold 'c', middle mouse click on curve to move the pivot point to the end of the curve |
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Under the 'Surfaces' menu, select 'Revolve' to create object |
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To close a curve you have just drawn with the CV Curve Tool, use 'Open/Close Curves' |
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Right click and 'Control Vertex' to move points around |
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Select the curve and a surface, then 'Project Curve on Surface' |
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Select the new projection... |
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...and select the surface, select 'Trim Tool', click on the surface, then press 'enter' |
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A hole has now been created in the surface |
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Right click and select 'Trim Edge' to select the edge |
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The theory behind creating the above objects is to 'Duplicate NURBS Patches' and move the duplicate curve back and then 'loft' between the two to create the "tunnel" |