Module name: trim_1

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Module declaration: GLOBAL GEOMETRY MODULE trim_1

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Module description:

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Trimming of curves: Sample 1

2006-04-16 Gunnar Liden

Create a surface

Coordinate system that defines the planar trim boundary

Start coordinate system for intersect curves

Make some planar intersects and trim the intersect curves

The module has no parameters (attributes)

Called modules:

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lofted_fuselage Create a fuselage surface with SUR_CONIC

s_trim_cur Trim a surface curve with a planar surface boundary curve

This document was created 2006-04-17 by module m_extdoc1

Module name: trim_2

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Module declaration: GLOBAL GEOMETRY MODULE trim_2

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Module description:

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Trimming of curves: Sample 2

2006-04-16 Gunnar Liden

Create a surface

Coordinate system that defines the planar trim boundary

Create approx. trimmed surface

The module has no parameters (attributes)

Module name: s_trim_cur

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Module declaration: GLOBAL GEOMETRY MODULE s_trim_cur

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Module description:

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Trim a surface curve with a surface boundary curve

defined by a planar intersect

Please note that input data is not a surface boundary

but a plane that defines the (one) boundary curve. The

reason that intersects are made with plane and not with

another surface curve is that intersects between surface

curves not is very stable.

2006-04-16 Gunnar Liden

Initializations and check of input data

Approximate with a bicubic surface for better performance or

if there are problems with intersections

Approximate with a cubic curve for better performance or

if there are problems with intersections

Create the intersection curve that trims the surface

Trim the curve

Module parameters:

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REF base_sur_id >"t16 Select surface";

REF csy_bound_id >"@t8192 Coordinate system defining boundary";

INT flag_bound:=1 >"Flag for boundary 1: Create curve";

REF i_trim_cur_id >"t8 Select curve to be trimmed";

INT graphic:=1 >"Graphic 0: Nothing 1: Curves 2: All");

No called modules

This document was created 2006-04-17 by module m_extdoc1

Module name: trimmed_appr_sur

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Module declaration: GLOBAL GEOMETRY MODULE trimmed_appr_sur

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Module description:

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With surface approximation, re-definition of surface parts,

etc. can surfaces be trimmed. But it is quite a lot of work

to do it, and the surfaces will be approximated.

For this sample works sur_composite unfortunately not

(the problem is probably a difference in parameterization)

2006-04-16 Gunnar Liden

Initializations and check of input data

Approximate with a bicubic surface. It is this bicubic

surface that will be trimmed

Create the intersect curve that shall trim the surface

Assume that the trimming are for V curves that starts in U=0

and ends for intersect for the plane

Determine minimum U for the curve

Trimming parameter values

Split surface with U curve

Create trimmed iso parameter curves on end split surface

Create the composite surface Does unfortunately not work!

Module parameters:

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REF base_sur_id >"t16 Select surface";

REF csy_bound_id >"@t8192 Coordinate system defining boundary";

INT graphic:=1 >"Graphic 0: Nothing 1: Curves 2: All");

No called modules

This document was created 2006-04-17 by module m_extdoc1