Wind effects on vegetation for Atmospheric Light Scattering: movement of trees and hires terrain texture noise simulating vegetation and debris movement
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Thorsten Renk
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ca5c8463ab
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b3bb82dd88
6 changed files with 124 additions and 25 deletions
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@ -104,7 +104,9 @@
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<cloud_self_shading><use>/environment/cloud-self-shading</use></cloud_self_shading>
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<moonlight><use>/environment/moonlight</use></moonlight>
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<season><use>/environment/season</use></season>
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<windspeed><use>/environment/wind-speed-kt</use></windspeed>
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<wind_effects><use>/sim/rendering/shaders/wind-effects</use></wind_effects>
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<windE><use>/environment/sea/surface/wind-from-east-fps</use></windE>
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<windN><use>/environment/sea/surface/wind-from-north-fps</use></windN>
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<quality_level><use>/sim/rendering/shaders/landmass</use></quality_level>
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<tquality_level><use>/sim/rendering/shaders/transition</use></tquality_level>
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</parameters>
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@ -346,11 +348,6 @@
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<name>wetness</name>
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<type>float</type>
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<value><use>wetness</use></value>
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</uniform>
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<uniform>
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<name>windspeed</name>
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<type>float</type>
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<value><use>windspeed</use></value>
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</uniform>
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<uniform>
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<name>fogstructure</name>
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@ -372,6 +369,16 @@
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<type>float</type>
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<value><use>season</use></value>
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</uniform>
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<uniform>
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<name>WindE</name>
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<type>float</type>
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<value><use>windE</use></value>
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</uniform>
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<uniform>
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<name>WindN</name>
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<type>float</type>
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<value><use>windN</use></value>
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</uniform>
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<uniform>
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<name>quality_level</name>
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<type>int</type>
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@ -382,6 +389,11 @@
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<type>int</type>
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<value><use>tquality_level</use></value>
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</uniform>
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<uniform>
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<name>wind_effects</name>
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<type>int</type>
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<value><use>wind_effects</use></value>
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</uniform>
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<uniform>
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<name>texture</name>
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<type>sampler-2d</type>
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@ -33,6 +33,9 @@
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<fogtype><use>/sim/rendering/shaders/skydome</use></fogtype>
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<fogstructure><use>/environment/fog-structure</use></fogstructure>
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<quality_level><use>/sim/rendering/shaders/landmass</use></quality_level>
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<wind_effects><use>/sim/rendering/shaders/wind-effects</use></wind_effects>
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<windE><use>/environment/sea/surface/wind-from-east-fps</use></windE>
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<windN><use>/environment/sea/surface/wind-from-north-fps</use></windN>
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<!-- END fog include -->
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</parameters>
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@ -135,6 +138,16 @@
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<type>float</type>
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<value><use>season</use></value>
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</uniform>
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<uniform>
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<name>WindE</name>
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<type>float</type>
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<value><use>windE</use></value>
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</uniform>
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<uniform>
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<name>WindN</name>
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<type>float</type>
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<value><use>windN</use></value>
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</uniform>
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<uniform>
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<name>texture</name>
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<type>sampler-2d</type>
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@ -150,6 +163,11 @@
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<type>int</type>
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<value><use>quality_level</use></value>
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</uniform>
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<uniform>
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<name>wind_effects</name>
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<type>int</type>
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<value><use>wind_effects</use></value>
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</uniform>
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</pass>
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</technique>
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@ -257,6 +275,16 @@
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<type>float</type>
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<value><use>season</use></value>
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</uniform>
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<uniform>
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<name>WindE</name>
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<type>float</type>
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<value><use>windE</use></value>
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</uniform>
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<uniform>
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<name>WindN</name>
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<type>float</type>
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<value><use>windN</use></value>
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</uniform>
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<uniform>
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<name>texture</name>
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<type>sampler-2d</type>
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@ -272,6 +300,11 @@
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<type>int</type>
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<value><use>quality_level</use></value>
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</uniform>
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<uniform>
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<name>wind_effects</name>
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<type>int</type>
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<value><use>wind_effects</use></value>
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</uniform>
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</pass>
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</technique>
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@ -44,7 +44,6 @@ uniform float fogstructure;
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uniform float snow_thickness_factor;
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uniform float cloud_self_shading;
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uniform float season;
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uniform float windspeed;
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uniform float grain_strength;
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uniform float intrinsic_wetness;
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uniform float transition_model;
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@ -52,9 +51,12 @@ uniform float hires_overlay_bias;
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uniform float dot_density;
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uniform float dot_size;
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uniform float dust_resistance;
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uniform float WindE;
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uniform float WindN;
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uniform float osg_SimulationTime;
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uniform int quality_level;
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uniform int tquality_level;
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uniform int wind_effects;
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const float EarthRadius = 5800000.0;
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const float terminator_width = 200000.0;
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@ -272,6 +274,34 @@ float msl_altitude = (relPos.z + eye_alt);
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float intensity;
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// Wind motion of the overlay noise simulating movement of vegetation and loose debris
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vec2 windPos;
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if (wind_effects > 1)
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{
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float windSpeed = length(vec2 (WindE,WindN)) /3.0480;
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// interfering sine wave wind pattern
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float sineTerm = sin(0.35 * windSpeed * osg_SimulationTime + 0.05 * (rawPos.x + rawPos.y));
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sineTerm = sineTerm + sin(0.3 * windSpeed * osg_SimulationTime + 0.04 * (rawPos.x + rawPos.y));
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sineTerm = sineTerm + sin(0.22 * windSpeed * osg_SimulationTime + 0.05 * (rawPos.x + rawPos.y));
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sineTerm = sineTerm/3.0;
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// non-linear amplification to simulate gusts
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sineTerm = sineTerm * sineTerm;//smoothstep(0.2, 1.0, sineTerm);
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// wind starts moving dust and leaves at around 8 m/s
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float timeArg = 0.01 * osg_SimulationTime * windSpeed * smoothstep(8.0, 15.0, windSpeed);
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timeArg = timeArg + 0.02 * sineTerm;
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windPos = vec2 (rawPos.x + WindN * timeArg, rawPos.y + WindE * timeArg);
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}
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else
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{
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windPos = rawPos.xy;
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}
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// get noise at different wavelengths
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// used: 5m, 5m gradient, 10m, 10m gradient: heightmap of the closeup terrain, 10m also snow
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@ -287,7 +317,7 @@ float noise_10m = Noise2D(rawPos.xy, 10.0);
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float noise_5m = Noise2D(rawPos.xy ,5.0);
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float noise_2m = Noise2D(rawPos.xy ,2.0);
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float noise_1m = Noise2D(rawPos.xy ,1.0);
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float noise_01m = Noise2D(rawPos.xy, 0.1);
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float noise_01m = Noise2D(windPos.xy, 0.1);
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float noisegrad_10m;
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float noisegrad_5m;
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@ -488,15 +518,7 @@ if ((dist < 5000.0)&& (quality_level > 3) && (combined_wetness>0.0))
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texel.rgb = texel.rgb * (1.0 - 0.6 * combined_wetness);
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// surf - terrain is too bad...
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/* foam_texel.rgb =vec3 (1.0, 1.0, 1.0);
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foam_texel.rg = 0.7 * foam_texel.rg +0.3 * noise_2m * foam_texel.rg;
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float surf_strength = 1.0 + windspeed/5.0;
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float surf_sine = sin(osg_SimulationTime+5.0*noise_25m);
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float surf_steepcorr = 1.0 -smoothstep(0.99,1.01,abs(steepness));
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float surf_alt = (relPos.z+eye_alt ) - 20.0 * surf_steepcorr ;//+ noise_10m * surf_steepcorr
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texel.rgb = mix(foam_texel.rgb, texel.rgb, smoothstep((0.3 +0.3*surf_strength+ surf_sine) * surf_steepcorr-20.0, (0.3+ surf_strength + surf_sine) * surf_steepcorr-19.0, surf_alt));
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*/
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// light computations
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@ -18,27 +18,26 @@
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// the surface normal is passed in gl_{Front,Back}Color. The alpha
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// component is set to 1 for front, 0 for back in order to work around
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// bugs with gl_FrontFacing in the fragment shader.
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//varying vec4 diffuse_term;
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//varying vec3 normal;
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varying vec3 relPos;
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//varying float earthShade;
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//varying float yprime;
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//varying float vertex_alt;
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varying vec3 relPos;
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varying float yprime_alt;
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//varying float mie_angle;
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uniform int colorMode;
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uniform int wind_effects;
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uniform float hazeLayerAltitude;
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uniform float terminator;
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uniform float terrain_alt;
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uniform float avisibility;
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uniform float visibility;
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uniform float overcast;
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//uniform float scattering;
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uniform float ground_scattering;
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uniform float snow_level;
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uniform float season;
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uniform float WindN;
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uniform float WindE;
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uniform float osg_SimulationTime;
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float earthShade;
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float mie_angle;
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@ -94,6 +93,14 @@ void main()
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// Rotation of the generic quad to specific one for the tree.
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position.xy = vec2(dot(position.xy, vec2(cr, sr)), dot(position.xy, vec2(-sr, cr)));
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// Shear by wind. Note that this only applies to the top vertices
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if (wind_effects > 0)
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{
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position.x = position.x + position.z * (sin(osg_SimulationTime * 1.8 + (gl_Color.x + gl_Color.y + gl_Color.z) * 0.01) + 1.0) * 0.0025 * WindN;
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position.y = position.y + position.z * (sin(osg_SimulationTime * 1.8 + (gl_Color.x + gl_Color.y + gl_Color.z) * 0.01) + 1.0) * 0.0025 * WindE;
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}
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// Move to correct location (stored in gl_Color)
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position = position + gl_Color.xyz;
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gl_Position = gl_ModelViewProjectionMatrix * vec4(position,1.0);
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@ -172,6 +172,30 @@
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<pref-width>55</pref-width>
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</empty>
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</group>
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<group>
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<layout>hbox</layout>
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<halign>right</halign>
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<text>
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<label>Wind Effects</label>
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</text>
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<slider>
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<name>wind</name>
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<min>0.0</min>
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<max>2.0</max>
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<step>1.0</step>
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<fraction>0.17</fraction>
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<live>true</live>
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<property>/sim/rendering/shaders/wind-effects</property>
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<binding>
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<command>dialog-apply</command>
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<object-name>wind</object-name>
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</binding>
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</slider>
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<empty>
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<pref-width>55</pref-width>
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</empty>
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</group>
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<group>
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<layout>hbox</layout>
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@ -147,6 +147,7 @@ Started September 2000 by David Megginson, david@megginson.com
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<transition type="float" userarchive="y">1.0</transition>
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<urban type="float" userarchive="y">1.0</urban>
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<water type="float" userarchive="y">1.0</water>
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<wind-effects type="float" userarchive="y">0.0</wind-effects>
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<lights type="float" userarchive="y">1.0</lights>
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<quality-level-internal type="float" userarchive="y">1.0</quality-level-internal>
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</shaders>
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