Light Source - Revision history

JavaJones at 23:10, 14 July 2019

2019-07-14T23:10:23Z

JavaJones at 21:28, 3 June 2012

2012-06-03T21:28:34Z

JavaJones at 21:17, 3 June 2012

2012-06-03T21:17:58Z

JavaJones at 18:45, 1 June 2011

2011-06-01T18:45:29Z

JavaJones at 02:38, 18 May 2011

2011-05-18T02:38:42Z

127.0.0.1: jrfconvert import

2010-07-11T02:55:11Z

jrfconvert import

New page

[[Category:IMPORT]]
='''Light Source'''=

[[Image:drex_module_14_image_0.png|485pxpx|Light Source]]
__NOTOC__

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 * '''Source centre:''' The position of the centre of the light source. Coordinates are X, Y, Z, measured in meters.
-* '''Source radius:''' The radius of the light source, measured in meters.
+* '''Source radius:''' The radius of the light source, measured in meters. Source radius only has an effect on the amount of illumination very close to the light source. It prevents the intensity from getting any brighter within the radius specified, and it also affects intensity at some small distance outside the radius.
 * '''Colour:''' The colour of the light source. The slider sets the Brightness, with a normal range between 0-1. The square colour swatch to the right opens a full colour picker.
-* '''Strength:''' The strength of the light source. Values are proportional to the surface area of the light source, so if you increase the radius, you need to increase the strength to maintain the same level of illumination. TBC
+* '''Strength:''' This controls the strength, i.e. brightness, of the light source. The value represents how much illumination power there is at distance of 1 metre. This intensity drops off according to the inverse square law, [http://en.wikipedia.org/wiki/Inverse-square_law Inverse Square Law at Wikipedia] The units are defined with respect to the pixel intensity in the final image, as they are in Terragen's [[Sunlight]] node. The difference between Sunlight and Light Source is that in Light Source these values only apply at a distance of 1 metre, so much larger values are needed to illuminate well at larger distances.
 * '''Max distance:''' The maximum distance at which the light source's effect on the scene will be calculated. You can use this to clip the lighting contribution of a light source to a specific distance. Measured in meters. TBC
 * '''Cast shadows:''' Control whether shadows are cast by objects interacting with this light source. If Cast shadows is disabled, the additional check boxes and controls for shadows below have no effect. TBC

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 [[Image:drex_module_14_image_0.png|485pxpx|Light Source]]
-'''Node Description and Purpose:'''
+'''Node Description and Purpose:''' The Light Source node provides an omnidirectional source of light in a Terragen scene.
 '''Node Type:''' Lighting

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 [[Image:drex_module_14_image_0.png|485pxpx|Light Source]]
-<!-- imported from file: module_14.html-->
+'''Node Description and Purpose:'''
 [[Category: Lighting Nodes]]

← Older revision		Revision as of 18:45, 1 June 2011
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	<!-- imported from file: module_14.html-->		<!-- imported from file: module_14.html-->

−	[[Category: Lighting Nodes\| ]]	+	[[Category: Lighting Nodes]]

← Older revision		Revision as of 02:38, 18 May 2011
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−	[[~~Category~~:~~IMPORT~~]]	+	[[Image:drex_module_14_image_0.png\|485pxpx\|Light Source]]
−	~~='''Light Source'''=~~

−	~~[[Image:drex_module_14_image_0.png\|485pxpx\|Light Source]]~~
−	~~__NOTOC__~~
	<!-- imported from file: module_14.html-->		<!-- imported from file: module_14.html-->
		+
		+	[[Category: Lighting Nodes\| ]]