User:Zeracles/Background - Revision history

Zeracles: /* Description */

2009-09-17T03:59:11Z

Description

← Older revision		Revision as of 03:59, 17 September 2009
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	*[[User:Zeracles/Background/Code/Structures\|Code]]		*[[User:Zeracles/Background/Code/Structures\|Code]]
	==Description==		==Description==
	This creates three-dimensional structures made of discrete points.		This creates three-dimensional structures made of discrete points, to make starmaps or distributions for the backgrounds.
	The available structures are single points, gaussians, hard-edged spheres, sheets / discs and filaments.		The available structures are single points, gaussians, hard-edged spheres, sheets / discs and filaments.
	Their properties (density, scale size, position) are input via a text file (called ``structureproperties") with the format listed in the code.		Their properties (density, scale size, position) are input via a text file (called ``structureproperties") with the format listed in the code.

Zeracles: /* Generating Point Distributions */

2009-09-17T03:56:57Z

Generating Point Distributions

← Older revision		Revision as of 03:56, 17 September 2009
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	All of these codes are written in matlab, and I can probably run them for you if you like.		All of these codes are written in matlab, and I can probably run them for you if you like.
	=Generating Point Distributions=		=Generating Point Distributions=
			*[[User:Zeracles/Background/Code/Structures\|Code]]
			==Description==
			This creates three-dimensional structures made of discrete points.
			The available structures are single points, gaussians, hard-edged spheres, sheets / discs and filaments.
			Their properties (density, scale size, position) are input via a text file (called ``structureproperties") with the format listed in the code.

			I'd also like to add the fractal generator to this at some point, not sure when I'll get around to it.

	=Stars=		=Stars=
	*[[User:Zeracles/Background/Code/Stars\|Code]]		*[[User:Zeracles/Background/Code/Stars\|Code]]

Zeracles: /* Stars */

2009-03-05T10:29:29Z

Stars

← Older revision		Revision as of 10:29, 5 March 2009
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	=Generating Point Distributions=		=Generating Point Distributions=
	=Stars=		=Stars=
			*[[User:Zeracles/Background/Code/Stars\|Code]]
	==Code Description==		==Code Description==
	A number of things get set through lines 6-42.		A number of things get set through lines 6-42.
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	All the action is in the nested for loop, lines 44-102. An image is generated for each point in the distribution (for i=...), and all these images are added together. Lines 68-93 actually calculate the pixel value, littlexgaussiancontribution. The condition at 75 says if a pixel is sufficiently far from the position of the point being smoothed, make its pixel value zero because it will be awfully close to zero anyway. Else, line 79 calculates the pixel value for a gaussian (a different function could easily be substituted here). If this star is going to have spokes (a fate determined by lines 20, 57 and 59), lines 81-90 modify the gaussian into something stellar. This is done by making the pixel value a function of angle, multiplying it by an angle-dependent variable, anglemagnification on line 86. The pixel value is thus modified on line 90.		All the action is in the nested for loop, lines 44-102. An image is generated for each point in the distribution (for i=...), and all these images are added together. Lines 68-93 actually calculate the pixel value, littlexgaussiancontribution. The condition at 75 says if a pixel is sufficiently far from the position of the point being smoothed, make its pixel value zero because it will be awfully close to zero anyway. Else, line 79 calculates the pixel value for a gaussian (a different function could easily be substituted here). If this star is going to have spokes (a fate determined by lines 20, 57 and 59), lines 81-90 modify the gaussian into something stellar. This is done by making the pixel value a function of angle, multiplying it by an angle-dependent variable, anglemagnification on line 86. The pixel value is thus modified on line 90.

	=Nebulae=		=Nebulae=

Zeracles at 10:26, 5 March 2009

2009-03-05T10:26:59Z

← Older revision		Revision as of 10:26, 5 March 2009
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	This is some procedurally generated art I worked on for [http://starcontrol.classicgaming.gamespy.com/forum/index.php?topic=1660.0 Dragon's SC1 remake].		This is some procedurally generated art I worked on for [http://starcontrol.classicgaming.gamespy.com/forum/index.php?topic=1660.0 Dragon's SC1 remake].
	All of these codes are written in matlab.		All of these codes are written in matlab, and I can probably run them for you if you like.
	=Generating Point Distributions=		=Generating Point Distributions=
	=Stars=		=Stars=

Zeracles: hastily assembled for some work I'm doing

2009-03-05T10:15:15Z

hastily assembled for some work I'm doing

New page

This is some procedurally generated art I worked on for [http://starcontrol.classicgaming.gamespy.com/forum/index.php?topic=1660.0 Dragon's SC1 remake].
All of these codes are written in matlab.
=Generating Point Distributions=
=Stars=
==Code Description==
A number of things get set through lines 6-42.
*n = number of points for the smoothing
*resolution = a smaller number here means more detail
*xmin, etc. = set image dimensions
*spokethreshold = fraction of stars without spokes. To smooth without spokes, set spokethreshold=1
*spokes = number of spokes
*anglemagnificationbase, anglemagnificationindex, anglecutoffradiusfactor = stuff to mess with the spokes on the stars
*xposns, yposns = random points to be smoothed . . . comment these out to import a set of one's choosing

All the action is in the nested for loop, lines 44-102. An image is generated for each point in the distribution (for i=...), and all these images are added together. Lines 68-93 actually calculate the pixel value, littlexgaussiancontribution. The condition at 75 says if a pixel is sufficiently far from the position of the point being smoothed, make its pixel value zero because it will be awfully close to zero anyway. Else, line 79 calculates the pixel value for a gaussian (a different function could easily be substituted here). If this star is going to have spokes (a fate determined by lines 20, 57 and 59), lines 81-90 modify the gaussian into something stellar. This is done by making the pixel value a function of angle, multiplying it by an angle-dependent variable, anglemagnification on line 86. The pixel value is thus modified on line 90.
=Nebulae=