Alpha-fading - Revision history

Nbohr1more at 16:02, 14 May 2017

2017-05-14T16:02:13Z

← Older revision		Revision as of 16:02, 14 May 2017
Line 40:		Line 40:
	blue global4		blue global4
	}		}
	{
			}

			</pre>

			Note: This section:

			<pre>

			{
	if (global5 == 2)		if (global5 == 2)
	blend add		blend add
Line 53:		Line 62:
	fragmentMap 3 _black // Specular		fragmentMap 3 _black // Specular
	}		}
	}

	</pre>		</pre>

			has been removed as it is no longer needed in TDM 2.0 (Standalone)

	Example LOD Entity Def:		Example LOD Entity Def:

Springheel at 18:25, 23 April 2017

2017-04-23T18:25:25Z

← Older revision		Revision as of 18:25, 23 April 2017
Line 1:		Line 1:
	idTech4 (aka Doom3) supports only an alpha threshold. That means the shader for a material sets an arbitrary threshold, and values in the alpha map below that value render opaque, and above that value transparent.		idTech4 (aka Doom3) supports only an alpha threshold. That means the shader for a material sets an arbitrary threshold, and values in the alpha map below that value render opaque, and above that value transparent.

	The results in pixels either being transparent, or opaque. The only other way to achive translucency is to set the [[translucent]] keyword in a shader. This however, fixes the translucency to 50%. ~~''[Springheel: can someone confirm this? It contradicts my experience with D3 materials.]''~~		The results in pixels either being transparent, or opaque. The only other way to achive translucency is to set the [[translucent]] keyword in a shader. This however, fixes the translucency to 50%.

	So there is no way to make models to appear ''fading-in'', or ''fading-out'', except by varying the alpha threshold. Together with a good alpha map with ramps, this can make things appear to burn-away (an effect used by D3 f.i. for the imps "burning" away after you killed them), or to "grow thinner" with distance.		So there is no way to make models to appear ''fading-in'', or ''fading-out'', except by varying the alpha threshold. Together with a good alpha map with ramps, this can make things appear to burn-away (an effect used by D3 f.i. for the imps "burning" away after you killed them), or to "grow thinner" with distance.

Nbohr1more at 01:46, 21 March 2014

2014-03-21T01:46:54Z

← Older revision		Revision as of 01:46, 21 March 2014
Line 8:		Line 8:

	:[[Image:Alphamaps.png\|400px\|Left: Diffuse Center: Normal alpha Right: Alpha with ramp]]		:[[Image:Alphamaps.png\|400px\|Left: Diffuse Center: Normal alpha Right: Alpha with ramp]]

			(note: the greyscale images above represents the alpha channel in a diffuse texture)

	Example Material with alpha-test:		Example Material with alpha-test:

Nbohr1more at 01:44, 21 March 2014

2014-03-21T01:44:55Z

← Older revision		Revision as of 01:44, 21 March 2014
Line 8:		Line 8:

	:[[Image:Alphamaps.png\|400px\|Left: Diffuse Center: Normal alpha Right: Alpha with ramp]]		:[[Image:Alphamaps.png\|400px\|Left: Diffuse Center: Normal alpha Right: Alpha with ramp]]

			Example Material with alpha-test:

			<pre>
			textures/darkmod/decals/vegetation/cattails_green
			{
			qer_editorimage textures/darkmod/decals/vegetation/cattail_atlas
			surftype15
			description "foliage"

			//twosided (we use rotated patches to save one surface hence one drawcall)
			nonsolid
			noshadows

			{
			blend diffusemap
			map textures/darkmod/decals/vegetation/cattail_atlas
			alphatest 0.5
			}

			// TDM Ambient Method Related
			{
			if (global5 == 1)
			blend add
			map textures/darkmod/decals/vegetation/cattail_atlas
			scale 1, 1
			red global2
			green global3
			blue global4
			}
			{
			if (global5 == 2)
			blend add
			program ambientEnvironment.vfp
			vertexParm 0 1, 1, 1, 1 // UV Scales for Diffuse and Bump
			vertexParm 1 1, 1, 1, 1 // (X,Y) UV Scale for specular
			vertexParm 2 global2, global3, global4, 1

			fragmentMap 0 cubeMap env/gen1
			fragmentMap 1 _flat // Bump
			fragmentMap 2 textures/darkmod/decals/vegetation/cattail_atlas // Diffuse
			fragmentMap 3 _black // Specular
			}
			}

			</pre>

			Example LOD Entity Def:

			<pre>

			entityDef atdm:nature_grass_base
			{
			"inherit" "atdm:nature_base"
			"editor_displayFolder" "Nature/Grass"

			"editor_color" ".4 0.8 0.1"
			"editor_usage" "Don't use, base for all TDM LOD grass patches."

			"solid" "0"

			// grass models usually do not have a clipmodel, resulting in "size == 0"
			// Adjust their density thus:
			"seed_base_density" "0.01"

			// grass may grow through cracks on gravel, but it certainly grows less dense
			"seed_material_gravel" "0.05"

			// turn off shadows from this distance on
			// "lod_1_distance" "250"
			// "model_lod_1" ""
			// "noshadows_lod_1" "1"

			// hide it from this distance on (it is a small object, so can vanish fast)
			"hide_distance" "1000"

			"lod_fadeout_range" "600"

			// by default use more dense grass
			"skin" "nature/long_grass_dense"
			}

			</pre>

	== See also ==		== See also ==

Springheel at 02:14, 1 June 2013

2013-06-01T02:14:12Z

← Older revision		Revision as of 02:14, 1 June 2013
Line 1:		Line 1:
	idTech4 (aka Doom3) supports only an alpha threshold. That means the shader for a material sets an arbitrary threshold, and values in the alpha map below that value render opaque, and above that value transparent.		idTech4 (aka Doom3) supports only an alpha threshold. That means the shader for a material sets an arbitrary threshold, and values in the alpha map below that value render opaque, and above that value transparent.

	The results in pixels either being transparent, or opaque. The only other way to achive translucency is to set the [[translucent]] keyword in a shader. This however, fixes the translucency to 50%. [Springheel: can someone confirm this? It contradicts my experience with D3 materials.]		The results in pixels either being transparent, or opaque. The only other way to achive translucency is to set the [[translucent]] keyword in a shader. This however, fixes the translucency to 50%. ''[Springheel: can someone confirm this? It contradicts my experience with D3 materials.]''

	So there is no way to make models to appear ''fading-in'', or ''fading-out'', except by varying the alpha threshold. Together with a good alpha map with ramps, this can make things appear to burn-away (an effect used by D3 f.i. for the imps "burning" away after you killed them), or to "grow thinner" with distance.		So there is no way to make models to appear ''fading-in'', or ''fading-out'', except by varying the alpha threshold. Together with a good alpha map with ramps, this can make things appear to burn-away (an effect used by D3 f.i. for the imps "burning" away after you killed them), or to "grow thinner" with distance.

Springheel at 02:13, 1 June 2013

2013-06-01T02:13:57Z

← Older revision		Revision as of 02:13, 1 June 2013
Line 1:		Line 1:
	idTech4 (aka Doom3) supports only an alpha threshold. That means the shader for a material sets an arbitrary threshold, and values in the alpha map below that value render opaque, and above that value transparent.		idTech4 (aka Doom3) supports only an alpha threshold. That means the shader for a material sets an arbitrary threshold, and values in the alpha map below that value render opaque, and above that value transparent.

	The results in pixels either being transparent, or opaque. The only other way to achive translucency is to set the [[translucent]] keyword in a shader. This however, fixes the translucency to 50%. [Springheel: can someone confirm this? It ~~goes against what I know of~~ D3 materials~~. According to Id, "translucent" is the same as using an alpha blend~~.]		The results in pixels either being transparent, or opaque. The only other way to achive translucency is to set the [[translucent]] keyword in a shader. This however, fixes the translucency to 50%. [Springheel: can someone confirm this? It contradicts my experience with D3 materials.]

	So there is no way to make models to appear ''fading-in'', or ''fading-out'', except by varying the alpha threshold. Together with a good alpha map with ramps, this can make things appear to burn-away (an effect used by D3 f.i. for the imps "burning" away after you killed them), or to "grow thinner" with distance.		So there is no way to make models to appear ''fading-in'', or ''fading-out'', except by varying the alpha threshold. Together with a good alpha map with ramps, this can make things appear to burn-away (an effect used by D3 f.i. for the imps "burning" away after you killed them), or to "grow thinner" with distance.

Springheel at 02:12, 1 June 2013

2013-06-01T02:12:52Z

← Older revision		Revision as of 02:12, 1 June 2013
Line 1:		Line 1:
	idTech4 (aka Doom3) supports only an alpha threshold. That means the shader for a material sets an arbitrary threshold, and values in the alpha map below that value render opaque, and above that value transparent.		idTech4 (aka Doom3) supports only an alpha threshold. That means the shader for a material sets an arbitrary threshold, and values in the alpha map below that value render opaque, and above that value transparent.

	The results in pixels either being transparent, or opaque. The only other way to achive translucency is to set the [[translucent]] keyword in a shader. This however, fixes the translucency to 50%.		The results in pixels either being transparent, or opaque. The only other way to achive translucency is to set the [[translucent]] keyword in a shader. This however, fixes the translucency to 50%. [Springheel: can someone confirm this? It goes against what I know of D3 materials. According to Id, "translucent" is the same as using an alpha blend.]

	So there is no way to make models to appear ''fading-in'', or ''fading-out'', except by varying the alpha threshold. Together with a good alpha map with ramps, this can make things appear to burn-away (an effect used by D3 f.i. for the imps "burning" away after you killed them), or to "grow thinner" with distance.		So there is no way to make models to appear ''fading-in'', or ''fading-out'', except by varying the alpha threshold. Together with a good alpha map with ramps, this can make things appear to burn-away (an effect used by D3 f.i. for the imps "burning" away after you killed them), or to "grow thinner" with distance.

Tels: add

2011-07-01T08:59:15Z

add

New page

idTech4 (aka Doom3) supports only an alpha threshold. That means the shader for a material sets an arbitrary threshold, and values in the alpha map below that value render opaque, and above that value transparent.

The results in pixels either being transparent, or opaque. The only other way to achive translucency is to set the [[translucent]] keyword in a shader. This however, fixes the translucency to 50%.

So there is no way to make models to appear ''fading-in'', or ''fading-out'', except by varying the alpha threshold. Together with a good alpha map with ramps, this can make things appear to burn-away (an effect used by D3 f.i. for the imps "burning" away after you killed them), or to "grow thinner" with distance.

Here is a crude example of such an alpha map (the black parts are transparent, white opaque):

:[[Image:Alphamaps.png|400px|Left: Diffuse Center: Normal alpha Right: Alpha with ramp]]

== See also ==

* [[twosided]]
* [[SEED]]