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cf9700c1
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three.js
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体验新版 GitCode,发现更多精彩内容 >>
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cf9700c1
编写于
10月 29, 2015
作者:
B
Ben Houston
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电子邮件补丁
差异文件
only use direct LOD computation, remove attempt to use bias as it didn't work well.
上级
99988a08
变更
1
显示空白变更内容
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1 changed file
with
5 addition
and
25 deletion
+5
-25
src/renderers/shaders/ShaderChunk/lights_pars.glsl
src/renderers/shaders/ShaderChunk/lights_pars.glsl
+5
-25
未找到文件。
src/renderers/shaders/ShaderChunk/lights_pars.glsl
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cf9700c1
...
...
@@ -145,37 +145,17 @@ uniform vec3 ambientLightColor;
}
// http://stackoverflow.com/a/24390149 modified to work on a cubeMap vec3.
float
textureQueryLodCUBE
(
const
in
vec3
sampleDirectionScaledByCubeWidth
)
{
vec3
dx_vtc
=
dFdx
(
sampleDirectionScaledByCubeWidth
);
vec3
dy_vtc
=
dFdy
(
sampleDirectionScaledByCubeWidth
);
float
delta_max_sqr
=
max
(
dot
(
dx_vtc
,
dx_vtc
),
dot
(
dy_vtc
,
dy_vtc
));
return
0
.
5
*
log2
(
delta_max_sqr
);
}
// this is not correct for cube maps.
float
getSamplerMIPLevel
(
const
in
int
maxMIPLevel
,
const
vec3
sampleDirection
)
{
float
envMapWidth
=
pow
(
2
.
0
,
float
(
maxMIPLevel
)
);
float
sampleMIPLevel
=
textureQueryLodCUBE
(
sampleDirection
*
(
envMapWidth
*
0
.
5
)
);
// only half because sampleDirection ranges of [-1,1]
// clamp to allowable LOD ranges.
return
clamp
(
sampleMIPLevel
,
0
.
0
,
float
(
maxMIPLevel
)
);
}
// taken from here: http://casual-effects.blogspot.ca/2011/08/plausible-environment-lighting-in-two.html
float
getSpecularMIPLevel
(
const
in
float
blinnShininessExponent
,
const
in
int
maxMIPLevel
)
{
float
envMapWidth
=
pow
(
2
.
0
,
float
(
maxMIPLevel
)
);
//float envMapWidth = pow( 2.0, maxMIPLevelScalar );
//float desiredMIPLevel = log2( envMapWidth * sqrt( 3.0 ) ) - 0.5 * log2( square( blinnShininessExponent ) + 1.0 );
float
desiredMIPLevel
=
float
(
maxMIPLevel
)
-
0
.
79248
-
0
.
5
*
log2
(
square
(
blinnShininessExponent
)
+
1
.
0
);
float
maxMIPLevelScalar
=
float
(
maxMIPLevel
);
float
desiredMIPLevel
=
maxMIPLevelScalar
-
0
.
79248
-
0
.
5
*
log2
(
square
(
blinnShininessExponent
)
+
1
.
0
);
// clamp to allowable LOD ranges.
return
clamp
(
desiredMIPLevel
,
0
.
0
,
float
(
maxMIPLevel
)
);
return
clamp
(
desiredMIPLevel
,
0
.
0
,
maxMIPLevelScalar
);
}
...
...
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