// -*- mode: C; -*- // Licence: GPL v2 // Authors: Frederic Bouvier and Gijs de Rooy // with major additions and revisions by // Emilian Huminiuc and Vivian Meazza 2011 // ported to Atmospheric Light Scattering // by Thorsten Renk, 2013 #version 120 varying vec3 VBinormal; varying vec3 VNormal; varying vec3 VTangent; varying vec3 rawpos; varying vec3 reflVec; varying vec3 vViewVec; varying vec3 vertVec; varying float alpha; uniform sampler2D BaseTex; uniform sampler2D LightMapTex; uniform sampler2D NormalTex; uniform sampler2D ReflMapTex; uniform sampler2D ReflGradientsTex; uniform sampler3D ReflNoiseTex; uniform samplerCube Environment; uniform sampler2D GrainTex; uniform int dirt_enabled; uniform int dirt_multi; uniform int lightmap_enabled; uniform int lightmap_multi; uniform int nmap_dds; uniform int nmap_enabled; uniform int refl_enabled; uniform int refl_map; uniform int grain_texture_enabled; uniform int darkmap_enabled; uniform int rain_enabled; uniform int cloud_shadow_flag; uniform int use_searchlight; uniform int use_landing_light; uniform int use_alt_landing_light; uniform float amb_correction; uniform float dirt_b_factor; uniform float dirt_g_factor; uniform float dirt_r_factor; uniform float lightmap_a_factor; uniform float lightmap_b_factor; uniform float lightmap_g_factor; uniform float lightmap_r_factor; uniform float nmap_tile; uniform float refl_correction; uniform float refl_fresnel; uniform float refl_noise; uniform float refl_rainbow; uniform float grain_magnification; uniform float wetness; uniform float rain_norm; uniform float darkmap_factor; uniform float avisibility; uniform float cloud_self_shading; uniform float eye_alt; uniform float ground_scattering; uniform float hazeLayerAltitude; uniform float moonlight; uniform float overcast; uniform float scattering; uniform float terminator; uniform float terrain_alt; uniform float visibility; uniform float air_pollution; uniform float osg_SimulationTime; uniform float landing_light1_offset; uniform float landing_light2_offset; uniform float landing_light3_offset; uniform float geo_light_x; uniform float geo_light_y; uniform float geo_light_z; uniform float geo_light_radius; uniform float geo_ambience; // constants needed by the light and fog computations ################################################### const float EarthRadius = 5800000.0; const float terminator_width = 200000.0; uniform vec3 lightmap_r_color; uniform vec3 lightmap_g_color; uniform vec3 lightmap_b_color; uniform vec3 lightmap_a_color; uniform float geo_light_r; uniform float geo_light_g; uniform float geo_light_b; uniform vec3 dirt_r_color; uniform vec3 dirt_g_color; uniform vec3 dirt_b_color; float DotNoise2D(in vec2 coord, in float wavelength, in float fractionalMaxDotSize, in float dot_density); float shadow_func (in float x, in float y, in float noise, in float dist); float fog_func (in float targ, in float altitude); float rayleigh_in_func(in float dist, in float air_pollution, in float avisibility, in float eye_alt, in float vertex_alt); float alt_factor(in float eye_alt, in float vertex_alt); float light_distance_fading(in float dist); float fog_backscatter(in float avisibility); vec3 rayleigh_out_shift(in vec3 color, in float outscatter); vec3 get_hazeColor(in float lightArg); vec3 searchlight(); vec3 landing_light(in float offset, in float offsetv); vec3 addLights(in vec3 color1, in vec3 color2); float light_func (in float x, in float a, in float b, in float c, in float d, in float e) { if (x > 30.0) {return e;} if (x < -15.0) {return 0.0;} return e / pow((1.0 + a * exp(-b * (x-c)) ),(1.0/d)); } void main (void) { vec4 texel = texture2D(BaseTex, gl_TexCoord[0].st); vec4 nmap = texture2D(NormalTex, gl_TexCoord[0].st * nmap_tile); vec4 reflmap = texture2D(ReflMapTex, gl_TexCoord[0].st); vec4 noisevec = texture3D(ReflNoiseTex, rawpos.xyz); vec4 lightmapTexel = texture2D(LightMapTex, gl_TexCoord[0].st); vec4 grainTexel; vec3 mixedcolor; vec3 N = vec3(0.0,0.0,1.0); float pf = 0.0; float pf1 = 0.0; ///some generic light scattering parameters vec3 shadedFogColor = vec3(0.55, 0.67, 0.88); vec3 moonLightColor = vec3 (0.095, 0.095, 0.15) * moonlight; float alt = eye_alt; float effective_scattering = min(scattering, cloud_self_shading); /// BEGIN geometry for light vec3 up = (gl_ModelViewMatrix * vec4(0.0,0.0,1.0,0.0)).xyz; //vec4 worldPos3D = (osg_ViewMatrixInverse * vec4 (0.0,0.0,0.0, 1.0)); //worldPos3D.a = 0.0; //vec3 up = (osg_ViewMatrix * worldPos3D).xyz; float dist = length(vertVec); float vertex_alt = max(100.0,dot(up, vertVec) + alt); float vertex_scattering = ground_scattering + (1.0 - ground_scattering) * smoothstep(hazeLayerAltitude -100.0, hazeLayerAltitude + 100.0, vertex_alt); vec3 lightHorizon = gl_LightSource[0].position.xyz - up * dot(up,gl_LightSource[0].position.xyz); float yprime = -dot(vertVec, lightHorizon); float yprime_alt = yprime - sqrt(2.0 * EarthRadius * vertex_alt); float lightArg = (terminator-yprime_alt)/100000.0; float earthShade = 0.6 * (1.0 - smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt)) + 0.4; float mie_angle; if (lightArg < 10.0) {mie_angle = (0.5 * dot(normalize(vertVec), normalize(gl_LightSource[0].position.xyz)) ) + 0.5;} else {mie_angle = 1.0;} float fog_vertex_alt = max(vertex_alt,hazeLayerAltitude); float fog_yprime_alt = yprime_alt; if (fog_vertex_alt > hazeLayerAltitude) { if (dist > 0.8 * avisibility) { fog_vertex_alt = mix(fog_vertex_alt, hazeLayerAltitude, smoothstep(0.8*avisibility, avisibility, dist)); fog_yprime_alt = yprime -sqrt(2.0 * EarthRadius * fog_vertex_alt); } } else { fog_vertex_alt = hazeLayerAltitude; fog_yprime_alt = yprime -sqrt(2.0 * EarthRadius * fog_vertex_alt); } float fog_lightArg = (terminator-fog_yprime_alt)/100000.0; float fog_earthShade = 0.9 * smoothstep(terminator_width+ terminator, -terminator_width + terminator, fog_yprime_alt) + 0.1; float ct = dot(normalize(up), normalize(vertVec)); /// END geometry for light /// BEGIN light vec4 light_diffuse; vec4 light_ambient; float intensity; light_diffuse.b = light_func(lightArg, 1.330e-05, 0.264, 3.827, 1.08e-05, 1.0); light_diffuse.g = light_func(lightArg, 3.931e-06, 0.264, 3.827, 7.93e-06, 1.0); light_diffuse.r = light_func(lightArg, 8.305e-06, 0.161, 3.827, 3.04e-05, 1.0); light_diffuse.a = 1.0; light_diffuse = light_diffuse * vertex_scattering; light_ambient.r = light_func(lightArg, 0.236, 0.253, 1.073, 0.572, 0.33); light_ambient.g = light_ambient.r * 0.4/0.33; light_ambient.b = light_ambient.r * 0.5/0.33; light_ambient.a = 1.0; if (earthShade < 0.5) { intensity = length(light_ambient.rgb); light_ambient.rgb = intensity * normalize(mix(light_ambient.rgb, shadedFogColor, 1.0 -smoothstep(0.1, 0.8,earthShade) )); light_ambient.rgb = light_ambient.rgb + moonLightColor * (1.0 - smoothstep(0.4, 0.5, earthShade)); intensity = length(light_diffuse.rgb); light_diffuse.rgb = intensity * normalize(mix(light_diffuse.rgb, shadedFogColor, 1.0 -smoothstep(0.1, 0.7,earthShade) )); } // at high altitude, the light gets de-saturated and the ambient channel dies out // whereas the diffuse channel is enhanced float alt_desat_factor = smoothstep(10000.0, 100000.0, eye_alt); float ambient_reduction = 0.1 + 0.9 * (1.0-alt_desat_factor); float diffuse_enhancement = 1.0 + 1.0 * (1.0 - ambient_reduction); light_ambient.rgb = light_ambient.rgb * ambient_reduction; light_diffuse.rgb = light_diffuse.rgb * diffuse_enhancement; light_ambient.rgb = light_ambient.rgb + moonLightColor * (1.0 - smoothstep(0.4, 0.5, earthShade)); //vec3 sky_blue = normalize (vec3 (0.17, 0.52, 0.87)); //intensity = length(light_ambient.rgb); //light_ambient.rgb = mix(light_ambient.rgb, intensity * sky_blue, alt_desat_factor); intensity = length(light_diffuse.rgb); light_diffuse.rgb = mix(light_diffuse.rgb, intensity * vec3 (1.0,1.0,1.0), alt_desat_factor); float diffuse_reduction = 1; if (darkmap_enabled == 1) { diffuse_reduction = mix(1.0,lightmapTexel.a, darkmap_factor); light_diffuse.rgb = light_diffuse.rgb * diffuse_reduction; } light_diffuse.rgb = clamp(light_diffuse.rgb, 0.0, 1.2); /// END light /// BEGIN grain overlay if (grain_texture_enabled ==1) { grainTexel = texture2D(GrainTex, gl_TexCoord[0].st * grain_magnification); texel.rgb = mix(texel.rgb, grainTexel.rgb, grainTexel.a ); } else if (grain_texture_enabled == 2) { grainTexel = texture2D(GrainTex, rawpos.xy * grain_magnification); texel.rgb = mix(texel.rgb, grainTexel.rgb, grainTexel.a ); } /// END grain overlay ///BEGIN bump if (nmap_enabled > 0){ N = nmap.rgb * 2.0 - 1.0; N = normalize(N.x * VTangent + N.y * VBinormal + N.z * VNormal); if (nmap_dds > 0) N = -N; } else { N = normalize(VNormal); } ///END bump vec4 reflection = textureCube(Environment, reflVec * dot(N,VNormal)); vec3 viewVec = normalize(vViewVec); float v = abs(dot(viewVec, normalize(VNormal)));// Map a rainbowish color vec4 fresnel = texture2D(ReflGradientsTex, vec2(v, 0.75)); vec4 rainbow = texture2D(ReflGradientsTex, vec2(v, 0.25)); float nDotVP = max(0.0, dot(N, normalize(gl_LightSource[0].position.xyz))); float nDotHV = max(0.0, dot(N, normalize(gl_LightSource[0].halfVector.xyz))); //glare on the backside of tranparent objects if ((gl_FrontMaterial.diffuse.a < 1.0 || texel.a < 1.0) && dot(N, normalize(gl_LightSource[0].position.xyz)) < 0.0) { nDotVP = max(0.0, dot(-N, normalize(gl_LightSource[0].position.xyz))); nDotHV = max(0.0, dot(-N, normalize(gl_LightSource[0].halfVector.xyz))); } float nDotVP1 = 0.0; float nDotHV1 = 0.0; // try specular reflection of sky irradiance nDotVP1 = max(0.0, dot(N, up)); nDotHV1 = max(0.0, dot(N, normalize(normalize(up) + normalize(-vertVec)))); if (nDotVP == 0.0) {pf = 0.0;} else {pf = pow(nDotHV, gl_FrontMaterial.shininess);} if (nDotVP1 == 0.0) {pf1 = 0.0;} else {pf1 = pow(nDotHV1, 0.5*gl_FrontMaterial.shininess);} vec3 relPos = (gl_ModelViewMatrixInverse * vec4 (vertVec,0.0)).xyz; if (cloud_shadow_flag == 1) { light_diffuse = light_diffuse * shadow_func(relPos.x, relPos.y, 1.0, dist); } vec3 secondary_light = vec3 (0.0,0.0,0.0); if (use_searchlight == 1) { secondary_light += searchlight(); } if (use_landing_light == 1) { secondary_light += landing_light(landing_light1_offset, landing_light3_offset); } if (use_alt_landing_light == 1) { secondary_light += landing_light(landing_light2_offset, landing_light3_offset); } vec3 geo_light_vec = (gl_ModelViewMatrix * vec4 (geo_light_x, geo_light_y, geo_light_z, 0.0)).xyz; vec3 geo_light_rel_vec = geo_light_vec -(gl_ModelViewMatrix * vec4 (rawpos, 0.0)).xyz; float geo_light_incidence = geo_ambience + (1.0- geo_ambience) * clamp(dot(N, geo_light_rel_vec),0.0, 1.0); vec3 geo_light = vec3 (geo_light_r, geo_light_g, geo_light_b) * (1.0 - smoothstep(0.5 * geo_light_radius, geo_light_radius, length(geo_light_rel_vec))) * geo_light_incidence; vec4 Diffuse = light_diffuse * nDotVP; //Diffuse.rgb += secondary_light * light_distance_fading(dist) + geo_light; Diffuse.rgb = addLights(Diffuse.rgb, secondary_light * light_distance_fading(dist)); Diffuse.rgb = addLights(Diffuse.rgb, geo_light * diffuse_reduction ); vec4 Specular = gl_FrontMaterial.specular * light_diffuse * pf + gl_FrontMaterial.specular * light_ambient * pf1; Specular+= gl_FrontMaterial.specular * pow(max(0.0,-dot(N,normalize(vertVec))),gl_FrontMaterial.shininess) * vec4(secondary_light,1.0); vec4 color = gl_Color * light_ambient + gl_FrontMaterial.emission; color = color + Diffuse * gl_FrontMaterial.diffuse; color = clamp( color, 0.0, 1.0 ); //////////////////////////////////////////////////////////////////// //BEGIN reflect //////////////////////////////////////////////////////////////////// if (refl_enabled > 0){ float reflFactor = 0.0; float transparency_offset = clamp(refl_correction, -1.0, 1.0);// set the user shininess offset if(refl_map > 0){ // map the shininess of the object with user input //float pam = (map.a * -2) + 1; //reverse map reflFactor = reflmap.a + transparency_offset; } else if (nmap_enabled > 0) { // set the reflectivity proportional to shininess with user input reflFactor = gl_FrontMaterial.shininess * 0.0078125 * nmap.a + transparency_offset; } else { reflFactor = gl_FrontMaterial.shininess* 0.0078125 + transparency_offset; } reflFactor = clamp(reflFactor, 0.0, 1.0); // add fringing fresnel and rainbow effects and modulate by reflection vec4 reflcolor = mix(reflection, rainbow, refl_rainbow * v); //vec4 reflcolor = reflection; vec4 reflfrescolor = mix(reflcolor, fresnel, refl_fresnel * v); vec4 noisecolor = mix(reflfrescolor, noisevec, refl_noise); vec4 raincolor = vec4(noisecolor.rgb * reflFactor, 1.0); raincolor += Specular; raincolor *= light_diffuse; mixedcolor = mix(texel, raincolor, reflFactor).rgb; } else { mixedcolor = texel.rgb; } ///////////////////////////////////////////////////////////////////// //END reflect ///////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////// //begin DIRT ////////////////////////////////////////////////////////////////////// if (dirt_enabled >= 1){ vec3 dirtFactorIn = vec3 (dirt_r_factor, dirt_g_factor, dirt_b_factor); vec3 dirtFactor = reflmap.rgb * dirtFactorIn.rgb; //dirtFactor.r = smoothstep(0.0, 1.0, dirtFactor.r); mixedcolor.rgb = mix(mixedcolor.rgb, dirt_r_color, smoothstep(0.0, 1.0, dirtFactor.r)); if (dirt_multi > 0) { //dirtFactor.g = smoothstep(0.0, 1.0, dirtFactor.g); //dirtFactor.b = smoothstep(0.0, 1.0, dirtFactor.b); mixedcolor.rgb = mix(mixedcolor.rgb, dirt_g_color, smoothstep(0.0, 1.0, dirtFactor.g)); mixedcolor.rgb = mix(mixedcolor.rgb, dirt_b_color, smoothstep(0.0, 1.0, dirtFactor.b)); } } ////////////////////////////////////////////////////////////////////// //END Dirt ////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////// //begin WETNESS ////////////////////////////////////////////////////////////////////// if (rain_enabled >0.0) { texel.rgb = texel.rgb * (1.0 - 0.6 * wetness); float rain_factor = 0.0; if (rain_norm > 0.0) { rain_factor += DotNoise2D(rawpos.xy, 0.2 ,0.5, rain_norm) * abs(sin(6.0*osg_SimulationTime)); rain_factor += DotNoise2D(rawpos.xy, 0.3 ,0.4, rain_norm) * abs(sin(6.0*osg_SimulationTime + 2.094)); rain_factor += DotNoise2D(rawpos.xy, 0.4 ,0.3, rain_norm)* abs(sin(6.0*osg_SimulationTime + 4.188)); } // secondary reflection of sky irradiance in water film float fresnelW = ((0.8 * wetness) ) * (1.0-smoothstep(0.0,0.4, dot(N,-normalize(vertVec)) * 1.0 - 0.2 * rain_factor * wetness)); float sky_factor = (1.0-ct*ct); vec3 sky_light = vec3 (1.0,1.0,1.0) * length(light_diffuse.rgb) * (1.0-effective_scattering); Specular.rgb += sky_factor * fresnelW * sky_light; } ///////////////////////////////////////////////////////////////////// //end WETNESS ////////////////////////////////////////////////////////////////////// // set ambient adjustment to remove bluiness with user input float ambient_offset = clamp(amb_correction, -1.0, 1.0); vec4 ambient = gl_LightModel.ambient + light_ambient; vec4 ambient_Correction = vec4(ambient.rg, ambient.b * 0.6, 1.0) * ambient_offset ; ambient_Correction = clamp(ambient_Correction, -1.0, 1.0); ambient_Correction = vec4 (0.0, 0.0, 0.0, 1.0); color.a = texel.a * alpha; vec4 fragColor = vec4(color.rgb * mixedcolor + ambient_Correction.rgb, color.a); fragColor += Specular * nmap.a; ////////////////////////////////////////////////////////////////////// // BEGIN lightmap ////////////////////////////////////////////////////////////////////// if ( lightmap_enabled >= 1 ) { vec3 lightmapcolor = vec3(0.0); vec4 lightmapFactor = vec4(lightmap_r_factor, lightmap_g_factor, lightmap_b_factor, lightmap_a_factor); lightmapFactor = lightmapFactor * lightmapTexel; if (lightmap_multi > 0 ){ //lightmapcolor = lightmap_r_color * lightmapFactor.r + //lightmap_g_color * lightmapFactor.g + //lightmap_b_color * lightmapFactor.b + //lightmap_a_color * lightmapFactor.a ; lightmapcolor = lightmap_r_color * lightmapFactor.r; lightmapcolor = addLights(lightmapcolor, lightmap_g_color * lightmapFactor.g); lightmapcolor = addLights(lightmapcolor, lightmap_b_color * lightmapFactor.b); if (darkmap_enabled == 0) { lightmapcolor = addLights(lightmapcolor, lightmap_a_color * lightmapFactor.a); } } else { lightmapcolor = lightmapTexel.rgb * lightmap_r_color * lightmapFactor.r; } fragColor.rgb = max(fragColor.rgb, lightmapcolor * gl_FrontMaterial.diffuse.rgb * smoothstep(0.0, 1.0, mixedcolor*.5 + lightmapcolor*.5)); } ////////////////////////////////////////////////////////////////////// // END lightmap ///////////////////////////////////////////////////////////////////// /// BEGIN fog amount float transmission; float vAltitude; float delta_zv; float H; float distance_in_layer; float transmission_arg; float eqColorFactor; float delta_z = hazeLayerAltitude - eye_alt; float mvisibility = min(visibility, avisibility); if (dist > 0.04 * mvisibility) { if (delta_z > 0.0) // we're inside the layer { if (ct < 0.0) // we look down { distance_in_layer = dist; vAltitude = min(distance_in_layer,mvisibility) * ct; delta_zv = delta_z - vAltitude; } else // we may look through upper layer edge { H = dist * ct; if (H > delta_z) {distance_in_layer = dist/H * delta_z;} else {distance_in_layer = dist;} vAltitude = min(distance_in_layer,visibility) * ct; delta_zv = delta_z - vAltitude; } } else // we see the layer from above, delta_z < 0.0 { H = dist * -ct; if (H < (-delta_z)) // we don't see into the layer at all, aloft visibility is the only fading { distance_in_layer = 0.0; delta_zv = 0.0; } else { vAltitude = H + delta_z; distance_in_layer = vAltitude/H * dist; vAltitude = min(distance_in_layer,visibility) * (-ct); delta_zv = vAltitude; } } transmission_arg = (dist-distance_in_layer)/avisibility; if (visibility < avisibility) { transmission_arg = transmission_arg + (distance_in_layer/visibility); eqColorFactor = 1.0 - 0.1 * delta_zv/visibility - (1.0 -effective_scattering); } else { transmission_arg = transmission_arg + (distance_in_layer/avisibility); eqColorFactor = 1.0 - 0.1 * delta_zv/avisibility - (1.0 -effective_scattering); } transmission = fog_func(transmission_arg, alt); if (eqColorFactor < 0.2) eqColorFactor = 0.2; } else { eqColorFactor = 1.0; transmission = 1.0; } /// END fog amount /// BEGIN fog color vec3 hazeColor = get_hazeColor(fog_lightArg); float rShade = 1.0 - 0.9 * smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt + 420000.0); float lightIntensity = length(hazeColor * effective_scattering) * rShade; if (transmission< 1.0) { if (fog_lightArg < 10.0) { intensity = length(hazeColor); float mie_magnitude = 0.5 * smoothstep(350000.0, 150000.0, terminator-sqrt(2.0 * EarthRadius * terrain_alt)); hazeColor = intensity * ((1.0 - mie_magnitude) + mie_magnitude * mie_angle) * normalize(mix(hazeColor, vec3 (0.5, 0.58, 0.65), mie_magnitude * (0.5 - 0.5 * mie_angle)) ); } intensity = length(hazeColor); hazeColor = intensity * normalize (mix(hazeColor, intensity * vec3 (1.0,1.0,1.0), 0.7* smoothstep(5000.0, 50000.0, alt))); hazeColor.r = hazeColor.r * 0.83; hazeColor.g = hazeColor.g * 0.9; float fade_out = max(0.65 - 0.3 *overcast, 0.45); intensity = length(hazeColor); hazeColor = intensity * normalize(mix(hazeColor, 1.5* shadedFogColor, 1.0 -smoothstep(0.25, fade_out,fog_earthShade) )); hazeColor = intensity * normalize(mix(hazeColor, shadedFogColor, (1.0-smoothstep(0.5,0.9,eqColorFactor)))); float shadow = mix( min(1.0 + dot(VNormal,gl_LightSource[0].position.xyz),1.0), 1.0, 1.0-smoothstep(0.1, 0.4, transmission)); hazeColor = mix(shadow * hazeColor, hazeColor, 0.3 + 0.7* smoothstep(250000.0, 400000.0, terminator)); } else { hazeColor = vec3 (1.0, 1.0, 1.0); } /// END fog color fragColor = clamp(fragColor, 0.0, 1.0); //hazeColor = clamp(hazeColor, 0.0, 1.0); ///BEGIN Rayleigh fog /// // Rayleigh color shift due to out-scattering float rayleigh_length = 0.5 * avisibility * (2.5 - 1.9 * air_pollution)/alt_factor(eye_alt, eye_alt+relPos.z); float outscatter = 1.0-exp(-dist/rayleigh_length); fragColor.rgb = rayleigh_out_shift(fragColor.rgb,outscatter); vec3 rayleighColor = vec3 (0.17, 0.52, 0.87) * lightIntensity; float rayleighStrength = rayleigh_in_func(dist, air_pollution, avisibility/max(lightIntensity,0.05), eye_alt, eye_alt + relPos.z); fragColor.rgb = mix(fragColor.rgb, rayleighColor,rayleighStrength); /// END Rayleigh fog // don't let the light fade out too rapidly lightArg = (terminator + 200000.0)/100000.0; float minLightIntensity = min(0.2,0.16 * lightArg + 0.5); vec3 minLight = minLightIntensity * vec3 (0.2, 0.3, 0.4); hazeColor *= eqColorFactor * fog_earthShade; hazeColor.rgb = max(hazeColor.rgb, minLight.rgb); fragColor.rgb = mix(hazeColor +secondary_light * fog_backscatter(mvisibility), fragColor.rgb,transmission); gl_FragColor = fragColor; }