Get Final Alpha - Revision history

Redmaw: Added deprecated statement.

2022-05-02T21:27:23Z

Added deprecated statement.

Redmaw: Conformed layout & updated GUI image.

2022-04-22T21:28:50Z

Conformed layout & updated GUI image.

Matt at 01:52, 7 October 2018

2018-10-07T01:52:08Z

JavaJones at 18:33, 1 June 2011

2011-06-01T18:33:59Z

JavaJones at 01:18, 18 May 2011

2011-05-18T01:18:30Z

Matt: /* Get Final Alpha */

2011-05-02T07:34:07Z

‎Get Final Alpha

Matt: /* Get Final Alpha */

2011-05-02T07:33:25Z

‎Get Final Alpha

Matt: /* Get Final Alpha */

2011-05-02T07:32:27Z

‎Get Final Alpha

Matt: /* Get Final Alpha */

2011-05-02T07:28:46Z

‎Get Final Alpha

JavaJones: /* Get Final Alpha */

2011-04-28T20:21:45Z

‎Get Final Alpha

← Older revision		Revision as of 21:27, 2 May 2022
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	[[File:GetFinalAlpha_00_GUI.png\|none\|470px\|Get Final Alpha]]		[[File:GetFinalAlpha_00_GUI.png\|none\|470px\|Get Final Alpha]]
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		+	'''''Due to advances in Terragen’s rendering architecture, this node is deprecated and no longer supported.'''''

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-[[Image:drex_module_29_image_0.png|485pxpx|Get Final Alpha]]
+<div style="float:right; border-style:solid; padding:20px"><categorytree mode=pages hideroot=off>Get</categorytree></div>
 Provides the "Final Alpha" of the current [[Render State]]. The [[Render State]] is affected by any shaders which were called before this function is called, among other things.
 The input connection is not used by this node (consistent with all [[:Get|Get nodes]]).
 Final Alpha is the value of the surface to be output to the image's Alpha channel (or Alpha element). Alpha is similar to opacity, but for the purpose of compositing the rendered image with other images such as a background plate. The alpha may be different from the opacity, especially where a fully opaque object (opacity of 1) is rendered with an alpha of 0 to allow a background image to show through in a composite.
-In Terragen, alphas and opacities have 3 channels to represent potentially different opacities in the Red, Green and Blue channels of an image. This is necessary to correctly composite media with wavelength-dependent scattering or absorption, such as planetary atmospheres and coloured glass.
+In Terragen, alphas and opacities have 3 channels to represent potentially different opacities in the Red, Green and Blue channels of an image. This is necessary to correctly composite media with wavelength-dependent scattering or absorption, such as planetary atmospheres and coloured glass.  For more information about compositing Terragen rendered elements click [[Compositing_Terragen_Render_Elements | here]].
 Although Final Alpha is defined to include atmosphere contributions if they have been applied, in practice [[Get Final Alpha]] will always provide the alpha of the surface prior to atmosphere due to the places where you can use it. Future changes to the renderer may expose contexts where functions can be used after atmosphere.
-<!-- imported from file: module_29.html-->
 [[Category:Get]]

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 Provides the "Final Alpha" of the current [[Render State]]. The [[Render State]] is affected by any shaders which were called before this function is called, among other things.
 Final Alpha is the value of the surface to be output to the image's Alpha channel (or Alpha element). Alpha is similar to opacity, but for the purpose of compositing the rendered image with other images such as a background plate. The alpha may be different from the opacity, especially where a fully opaque object (opacity of 1) is rendered with an alpha of 0 to allow a background image to show through in a composite.
@@ Line 8: / Line 10: @@
 Although Final Alpha is defined to include atmosphere contributions if they have been applied, in practice [[Get Final Alpha]] will always provide the alpha of the surface prior to atmosphere due to the places where you can use it. Future changes to the renderer may expose contexts where functions can be used after atmosphere.
 <!-- imported from file: module_29.html-->
 [[Category:Get]]

← Older revision		Revision as of 18:33, 1 June 2011
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	<!-- imported from file: module_29.html-->		<!-- imported from file: module_29.html-->

−	[[Category:Get\| ]]	+	[[Category:Get]]

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 [[Image:drex_module_29_image_0.png|485pxpx|Get Final Alpha]]
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 The Input connection is not used by this node.
 <!-- imported from file: module_29.html-->

@@ Line 8: / Line 8: @@
 Final Alpha is the value of the surface to be output to the image's Alpha channel (or Alpha element). Alpha is similar to opacity, but for the purpose of compositing the rendered image with other images such as a background plate. The alpha may be different from the opacity, especially where a fully opaque object (opacity of 1) is rendered with an alpha of 0 to allow a background image to show through in a composite.
-In Terragen, alphas and opacities have 3 channels to represent potentially different opacities in the Red, Green and Blue channels of an image. This is necessary to correctly composite media with wavelength-dependent scattering, such as planetary atmospheres and coloured glass.
+In Terragen, alphas and opacities have 3 channels to represent potentially different opacities in the Red, Green and Blue channels of an image. This is necessary to correctly composite media with wavelength-dependent scattering or absorption, such as planetary atmospheres and coloured glass.
 Although Final Alpha is defined to include atmosphere contributions if they have been applied, in practice [[Get Final Alpha]] will always provide the alpha of the surface prior to atmosphere. Future changes to the renderer may expose contexts where functions can be used after atmosphere.