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ALS volumetric grass responds to wind

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Thorsten Renk 2017-06-08 13:19:59 +03:00
parent 6dd9f6e8d9
commit 290f22d5ef
2 changed files with 39 additions and 46 deletions
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53
Effects/grass.eff
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@ -4,30 +4,7 @@
<inherits-from>Effects/airfield</inherits-from>
<parameters>
<!--<texture n="13">
<image>Textures/Terrain/airport_grass2.png</image>
<type>2d</type>
<filter>linear-mipmap-linear</filter>
<wrap-s>repeat</wrap-s>
<wrap-t>repeat</wrap-t>
<internal-format>normalized</internal-format>
</texture>
<texture n="14">
<image>Textures/Terrain/void.png</image>
<type>2d</type>
<filter>linear-mipmap-linear</filter>
<wrap-s>repeat</wrap-s>
<wrap-t>repeat</wrap-t>
<internal-format>normalized</internal-format>
</texture>
<texture n="15">
<image>Textures/Terrain/void.png</image>
<type>2d</type>
<filter>linear-mipmap-linear</filter>
<wrap-s>repeat</wrap-s>
<wrap-t>repeat</wrap-t>
<internal-format>normalized</internal-format>
</texture>-->
<texture n="20">
<image>Textures/Terrain/airport-grass-autumn.png</image>
<type>2d</type>
@ -37,22 +14,13 @@
<wrap-t>repeat</wrap-t>
<internal-format>normalized</internal-format>
</texture>
<!--<base_layer_magnification>5.0</base_layer_magnification>
<overlay_layer_magnification>4.0</overlay_layer_magnification>
<grain_layer_magnification>4.0</grain_layer_magnification>
<use_overlay>0</use_overlay>
<use_grain>0</use_grain>
<use_color_overlay>1</use_color_overlay>
<grit_alpha>1.0</grit_alpha>
<overlay_bias>0.0</overlay_bias>
<overlay_alpha>1.0</overlay_alpha>-->
<max_grass_height>0.3</max_grass_height>
<grass_density>1.0</grass_density>
<grass_groups>2</grass_groups>
<grass_modulate_by_overlay>0</grass_modulate_by_overlay>
<grass_modulate_height_min>0.0</grass_modulate_height_min>
<bend-x>0</bend-x>
<bend-y>0</bend-y>
<windE><use>/environment/sea/surface/wind-from-east-fps</use></windE>
<windN><use>/environment/sea/surface/wind-from-north-fps</use></windN>
</parameters>
@ -707,17 +675,17 @@
<value><use>scattering</use></value>
</uniform>
<uniform>
<name>bend_x</name>
<name>wind_x</name>
<type>float</type>
<value>
<use>bend-x</use>
<use>windE</use>
</value>
</uniform>
<uniform>
<name>bend_y</name>
<uniform>
<name>wind_y</name>
<type>float</type>
<value>
<use>bend-y</use>
<use>windN</use>
</value>
</uniform>
<uniform>
@ -810,6 +778,11 @@
<type>int</type>
<value><use>display_ysize</use></value>
</uniform>
<uniform>
<name>wind_effects</name>
<type>int</type>
<value><use>wind_effects</use></value>
</uniform>
<blend>
<active>true</active>

32
Shaders/grass-ALS.frag
View file

@ -13,11 +13,12 @@ uniform float max_height;
uniform float grass_density;
uniform float grass_modulate_height_min;
uniform float bend_x;
uniform float bend_y;
uniform float wind_x;
uniform float wind_y;
uniform int grass_modulate_by_overlay;
uniform int grass_groups;
uniform int wind_effects;
uniform sampler2D colorTex;
uniform sampler2D densityTex;
@ -64,8 +65,8 @@ float bladeNoise2D(in float x, in float y, in float dDensity, in float layer, in
float xoffset = (rand2D(vec2(integer_x, integer_y)) -0.5);
float yoffset = (rand2D(vec2(integer_x+1.0, integer_y)) - 0.5);
float xbend = (rand2D(vec2(integer_x+1.0, integer_y + 1.0)) - 0.5) + bend_x;
float ybend = (rand2D(vec2(integer_x, integer_y + 1.0)) - 0.5) + bend_y;
float xbend = (rand2D(vec2(integer_x+1.0, integer_y + 1.0)) - 0.5);
float ybend = (rand2D(vec2(integer_x, integer_y + 1.0)) - 0.5);
float fraction = BLADE_FRACTION * (0.5 + 0.5 * (1.0 - smoothstep(0.5, 1.0, layer)));
float bend = 0.5 * layer * layer;
@ -83,11 +84,30 @@ return bladeNoise2D(coord.x/wavelength, coord.y/wavelength, dDensity, layer, d_f
void main()
{
vec2 texCoord = gl_TexCoord[0].st;
if (season > 1.6) {discard;}
if (g_distance_to_eye > MAX_DISTANCE) {discard;}
vec2 texCoord = gl_TexCoord[0].st;
if (wind_effects > 1)
{
vec2 windDir = normalize(vec2 (max(wind_x, 0.1), wind_y) );
float windStrength = 0.5 * length(vec2 (wind_x, wind_y));
float windAmplitude = 1.0 + 0.3 * windStrength;
float sineTerm = sin(0.7 * windStrength * osg_SimulationTime + 0.05 * (g_rawpos.x + g_rawpos.y));
sineTerm = sineTerm + sin(0.6 * windStrength * osg_SimulationTime + 0.04 * (g_rawpos.x + g_rawpos.y));
sineTerm = sineTerm + sin(0.44 * windStrength * osg_SimulationTime + 0.05 * (g_rawpos.x + g_rawpos.y));
sineTerm = sineTerm/3.0;
sineTerm = 5.0 * sineTerm * sineTerm;
float windDisplacement = pow(g_layer/32.0, 2.0) * clamp((windStrength + windAmplitude * sineTerm), -30.0, 30.0);
texCoord += (windDisplacement * windDir);
}