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TIRE(1)			     BRL-CAD User Commands		       TIRE(1)

NAME
       tire - Generate a tire model, given standard tire dimensional
       information

SYNOPSIS
       tire [options ......] [name]

DESCRIPTION
       tire creates a curved sidewall tire in either the current open database
       (when run from within MGED) or in tire.g	when run from the command
       line. If	no dimensions are supplied defaults are	used. The default is
       to not model tread (due to performance issues), but tread modeling is
       implemented and available as a user option with the -p flag and the -t
       flag.

       -a # instructs tire to automatically add	dimensional information	to the
       toplevel	object name used in the	generated BRL-CAD database tree. Works
       with the	-n option or as	stand-alone. Output format uses	'-' instead of
       '/' because the latter has significance in BRL-CAD object trees.

OPTIONS
       -c count
	   sets	the number of tread patterns used when adding tread to a tire.
	   A tread pattern is the repeated shape or combination	of shapes used
	   in tire tread definitions.

       -d width/ratio/wheeldiam	#
	   This	option accepts tire dimensions in the form of width of the
	   tire	(in mm), ratio of sidewall height to tire width, and the
	   diameter of the wheel the tire is designed to fit over (in inches).
	   This	is a fairly standard method for	specifying automotive tire
	   dimensions, and BRL-CAD can use these dimensions to create a	model
	   with	approximately those dimensions.	The '/'	character will work
	   but other options are also allowed provided they don't have numeric
	   significance	- for example the common notation
	   width/ratioRwheeldiam will work as-is.

       -W width	#
	   Specify the maximum sidewall	width of the tire in mm. This option
	   overrides the -d option if used together, or	the default if used
	   alone. Can be used with the -R and -D flags.	Unlike the -d flag,
	   this	flag allows floating point input - use this flag if you	need
	   to specify width more precisely than	1mm.

       -R ratio	#
	   Specify the ratio of	the sidewall height to the maximum tire	width.
	   This	option overrides the -d	option if used together, or the
	   default if used alone. Can be used with the -W and -D flags.	Unlike
	   the -d flag,	allows floating	point input for	more precise
	   definition of ratio.

       -D rim diameter #
	   Specify the diameter	of the rim (a.k.a. the steel wheel) in inches.
	   This	option overrides the -d	option if used together, or the
	   default if used alone. Can be used with the -W and -R flags.	Unlike
	   the -d flag,	allows floating	point input for	more precise
	   definition of rim diameter.

       -g depth	#
	   Specify the tread depth in 32nds of an inch.	So, for	example, -g 13
	   would create	a tread	depth of 13/32in.

       -j width	#
	   Specify the rim width in inches.

       -n name #
	   allows the user to specify a	name other than	'tire' for the root
	   name	of the toplevel	database object. Works with the	-a option or
	   as stand-alone.

       -p type#
	   Select tread	pattern	to model. Note:	tread modeling can
	   SIGNIFICANTLY lengthen raytracing times, depending on the tread.

       -s radius#
	   Set the radius from the tire	center of the maximum width point on
	   the sidewall.

       -t type#
	   Select tread	shape to model.	Note: tread modeling can SIGNIFICANTLY
	   lengthen raytracing times, depending	on the tread.

       -u thickness#
	   Specify tire	thickness in mm.

       -w #
	   Specify wheel/rim type. If 0, include no wheel. As of 7.12.6	only
	   one wheel type is included by default.

EXAMPLE
       The following will create a tire	with width=185mm, ratio=65mm, and
       wheel diameter =	15in. The -t flag will instruct	the procedure to model
       using tread type	one, the -n flag will set the root name	to 'autowheel'
       instead of tire,	and the	-a flag	will append '-185-65R15' to
       'autowheel' to create the final toplevel	name 'autowheel-185-65R15' in
       the database rather than	'tire'.

       Example 1. Creating a 185/65R15 tire with wheel

       tire -d 185/65R15 -t 1 -a -n autowheel

DIAGNOSTICS
       Not much	error checking yet - need to add.

AUTHOR
       Clifford	Yapp

COPYRIGHT
       This software is	Copyright (c) 2008-2019	United States Government as
       represented by the U.S. Army Research Laboratory.

BUGS
       There is	a known	problem	where specifying very thin tires with a	large
       inner wheel will	cause incorrect	geometry to be produced	- this has to
       do with how the elliptical torus	primitive is handled. Other extreme
       cases such as extremely thin tire walls would also be expected to cause
       problems.

BUG REPORTS
       Reports of bugs or problems should be submitted via electronic mail to
       devs@brlcad.org

BRL-CAD				  08/29/2020			       TIRE(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLE | DIAGNOSTICS | AUTHOR | COPYRIGHT | BUGS | BUG REPORTS

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