diff --git a/Effects/birdswarm.eff b/Effects/birdswarm.eff
new file mode 100644
index 000000000..21d329039
--- /dev/null
+++ b/Effects/birdswarm.eff
@@ -0,0 +1,166 @@
+
+
+
+ Effects/birdswarm
+
+
+
+ Models/Effects/birds_in_flight.png
+ 2d
+ linear-mipmap-linear
+ repeat
+ repeat
+ normalized
+
+
+ 0.9
+ 0.8
+ 0.82
+ 0.7
+ 0.3
+ 0.25
+
+
+
+
+
+
+
+
+
+
+
+
+ /sim/rendering/shaders/skydome
+
+
+ 2.0
+
+
+
+ GL_ARB_shader_objects
+ GL_ARB_shading_language_100
+ GL_ARB_vertex_shader
+ GL_ARB_fragment_shader
+
+
+
+
+
+ true
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ 111
+ DepthSortedBin
+
+
+ 0
+
+
+
+
+
+
+
+
+ false
+
+ false
+
+ Shaders/birds-ALS.vert
+ Shaders/birds-ALS.frag
+ Shaders/noise.frag
+ Shaders/hazes.frag
+
+
+
+
+ color_base_r
+ float
+
+
+
+ color_base_g
+ float
+
+
+
+ color_base_b
+ float
+
+
+
+ color_alt_r
+ float
+
+
+
+ color_alt_g
+ float
+
+
+
+ color_alt_b
+ float
+
+
+
+ visibility
+ float
+
+
+
+ avisibility
+ float
+
+
+
+ hazeLayerAltitude
+ float
+
+
+
+ scattering
+ float
+
+
+
+ eye_alt
+ float
+
+
+
+ terminator
+ float
+
+
+
+ texture
+ sampler-2d
+ 0
+
+
+ texture
+ sampler-2d
+ 0
+
+
+
+
+
diff --git a/Models/Effects/Birds/birds.ac b/Models/Effects/Birds/birds.ac
new file mode 100644
index 000000000..566004b12
--- /dev/null
+++ b/Models/Effects/Birds/birds.ac
@@ -0,0 +1,22 @@
+AC3Db
+MATERIAL "DefaultWhite" rgb 1.0000 1.0000 1.0000 amb 0.2000 0.2000 0.2000 emis 0.0000 0.0000 0.0000 spec 0.5000 0.5000 0.5000 shi 10 trans 0.0000
+MATERIAL "DefaultWhite" rgb 1.0000 1.0000 1.0000 amb 0.2000 0.2000 0.2000 emis 0.0000 0.0000 0.0000 spec 0.0250 0.0250 0.0250 shi 50 trans 0.1000
+OBJECT world
+name "Blender_export__birds1.ac"
+kids 1
+OBJECT poly
+name "birds1"
+numvert 4
+-0.0000019 -1.0000000 -1.0000000
+-0.0000005 1.0000000 -1.0000000
+0.0000005 -1.0000000 1.0000000
+0.0000019 1.0000000 1.0000000
+numsurf 1
+SURF 0X20
+mat 1
+refs 4
+1 0 0
+0 0 0
+2 0 0
+3 0 0
+kids 0
diff --git a/Models/Effects/Birds/birds_in_flight.png b/Models/Effects/Birds/birds_in_flight.png
new file mode 100644
index 000000000..aaa96c691
Binary files /dev/null and b/Models/Effects/Birds/birds_in_flight.png differ
diff --git a/Models/Effects/Birds/birdswarm.ac b/Models/Effects/Birds/birdswarm.ac
new file mode 100644
index 000000000..f3c6798e8
--- /dev/null
+++ b/Models/Effects/Birds/birdswarm.ac
@@ -0,0 +1,22 @@
+AC3Db
+MATERIAL "DefaultWhite" rgb 1.0000 1.0000 1.0000 amb 0.2000 0.2000 0.2000 emis 0.0000 0.0000 0.0000 spec 0.5000 0.5000 0.5000 shi 10 trans 1.0000
+MATERIAL "DefaultWhite" rgb 1.0000 1.0000 1.0000 amb 0.2000 0.2000 0.2000 emis 0.0000 0.0000 0.0000 spec 0.0250 0.0250 0.0250 shi 50 trans 1.0000
+OBJECT world
+name "Blender_export__procedural_light.ac"
+kids 1
+OBJECT poly
+name "birdswarm"
+numvert 4
+-0.0000019 -1.0000000 -1.0000000
+-0.0000005 1.0000000 -1.0000000
+0.0000005 -1.0000000 1.0000000
+0.0000019 1.0000000 1.0000000
+numsurf 1
+SURF 0X20
+mat 1
+refs 4
+1 0 0
+0 0 0
+2 0 0
+3 0 0
+kids 0
diff --git a/Models/Effects/Birds/birdswarm.xml b/Models/Effects/Birds/birdswarm.xml
new file mode 100644
index 000000000..75f3de4db
--- /dev/null
+++ b/Models/Effects/Birds/birdswarm.xml
@@ -0,0 +1,22 @@
+
+
+
+
+ birdswarm1.xml
+
+
+
+ birdswarm2.xml
+
+
+
+ birdswarm3.xml
+
+
+
+ birdswarm4.xml
+
+
+
+
+
diff --git a/Models/Effects/Birds/birdswarm1.xml b/Models/Effects/Birds/birdswarm1.xml
new file mode 100644
index 000000000..c2f28d4b3
--- /dev/null
+++ b/Models/Effects/Birds/birdswarm1.xml
@@ -0,0 +1,25 @@
+
+
+
+ birds.ac
+
+
+ 0
+ 0
+ 200.0
+
+
+ birds1
+ scale
+ 50.0
+ 50.0
+ 50.0
+
+
+
+ Effects/birdswarm
+ birds1
+
+
+
+
diff --git a/Models/Effects/Birds/birdswarm2.xml b/Models/Effects/Birds/birdswarm2.xml
new file mode 100644
index 000000000..d142ea917
--- /dev/null
+++ b/Models/Effects/Birds/birdswarm2.xml
@@ -0,0 +1,28 @@
+
+
+
+ birds.ac
+
+
+ 40
+ 20
+ 200.0
+
+
+ birds1
+ scale
+ 50.0
+ 50.0
+ 50.0
+
+
+
+ Effects/birdswarm
+ birds1
+
+
+
+
+
+
+
diff --git a/Models/Effects/Birds/birdswarm3.xml b/Models/Effects/Birds/birdswarm3.xml
new file mode 100644
index 000000000..79092d689
--- /dev/null
+++ b/Models/Effects/Birds/birdswarm3.xml
@@ -0,0 +1,25 @@
+
+
+
+ birds.ac
+
+
+ 60
+ 5
+ 190.0
+
+
+ birds1
+ scale
+ 50.0
+ 50.0
+ 50.0
+
+
+
+ Effects/birdswarm
+ birds1
+
+
+
+
diff --git a/Models/Effects/Birds/birdswarm4.xml b/Models/Effects/Birds/birdswarm4.xml
new file mode 100644
index 000000000..fb16eed76
--- /dev/null
+++ b/Models/Effects/Birds/birdswarm4.xml
@@ -0,0 +1,25 @@
+
+
+
+ birds.ac
+
+
+ 85
+ -30
+ 210.0
+
+
+ birds1
+ scale
+ 50.0
+ 50.0
+ 50.0
+
+
+
+ Effects/birdswarm
+ birds1
+
+
+
+
diff --git a/Shaders/birds-ALS.frag b/Shaders/birds-ALS.frag
new file mode 100644
index 000000000..0e0f43d21
--- /dev/null
+++ b/Shaders/birds-ALS.frag
@@ -0,0 +1,206 @@
+// -*-C++-*-
+
+uniform sampler2D texture;
+
+uniform float color_base_r;
+uniform float color_base_g;
+uniform float color_base_b;
+
+uniform float color_alt_r;
+uniform float color_alt_g;
+uniform float color_alt_b;
+
+uniform float visibility;
+uniform float avisibility;
+uniform float hazeLayerAltitude;
+uniform float eye_alt;
+uniform float terminator;
+uniform float scattering;
+
+uniform float osg_SimulationTime;
+
+
+varying vec3 vertex;
+varying vec3 relPos;
+varying vec3 normal;
+
+const float terminator_width = 200000.0;
+
+float Noise2D(in vec2 coord, in float wavelength);
+float VoronoiNoise2D(in vec2 coord, in float wavelength, in float xrand, in float yrand);
+float fog_func (in float targ, in float alt);
+
+float light_func (in float x, in float a, in float b, in float c, in float d, in float e)
+{
+//x = x - 0.5;
+
+// use the asymptotics to shorten computations
+if (x < -15.0) {return 0.0;}
+
+return e / pow((1.0 + a * exp(-b * (x-c)) ),(1.0/d));
+}
+
+
+void main()
+{
+
+float noise = 0.0;
+
+
+vec3 color_base = vec3 (color_base_r, color_base_g, color_base_b);
+vec3 color_alt = vec3 (color_alt_r, color_alt_g, color_alt_b);
+vec3 shadedFogColor = vec3(0.55, 0.67, 0.88);
+
+
+vec3 viewDir = normalize(relPos);
+
+
+vec2 lookup_coords = vertex.yz;
+lookup_coords.x += 0.03* osg_SimulationTime;
+
+float domain_size = 0.05;
+float r = length(vertex);
+
+float domain_noise = VoronoiNoise2D(lookup_coords, domain_size, 0.0, 0.0);
+domain_noise = domain_noise * (1.0- smoothstep(0.5, 1.0, r));
+
+if (domain_noise < 0.9) {discard;}
+
+
+
+// fogging
+
+float dist = length(relPos);
+float delta_z = hazeLayerAltitude - eye_alt;
+float transmission;
+float vAltitude;
+float delta_zv;
+float H;
+float distance_in_layer;
+float transmission_arg;
+
+ // angle with horizon
+ float ct = dot(vec3(0.0, 0.0, 1.0), relPos)/dist;
+
+
+ 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,min(visibility, avisibility)) * 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))
+ {
+ 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);
+ }
+ else
+ {
+ transmission_arg = transmission_arg + (distance_in_layer/avisibility);
+ }
+
+
+
+ transmission = fog_func(transmission_arg, 0.0);
+ float lightArg = terminator/100000.0;
+ float earthShade = 0.6 * (1.0 - smoothstep(-terminator_width+ terminator, terminator_width + terminator, 0.0)) + 0.4;
+
+ vec4 light_diffuse;
+
+
+ light_diffuse.b = light_func(lightArg , 1.330e-05, 0.264, 2.227, 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 *=scattering;
+
+
+ float intensity = length(light_diffuse.rgb);
+ light_diffuse.rgb = intensity * normalize(mix(light_diffuse.rgb, shadedFogColor, 1.0 -smoothstep(0.4, 0.7,earthShade) ));
+
+
+vec4 domainTexel;
+
+
+if (domain_noise > 0.9) {domainTexel = vec4 (1.0, 1.0, 1.0, 1.0);}
+else {domainTexel = vec4 (0.0, 0.0, 0.0, 0.0);}
+
+
+
+vec2 coords_raw = lookup_coords/domain_size;
+coords_raw += vec2(0.5,0.5);
+float coord_int_x = coords_raw.x - fract(coords_raw.x) ;
+float coord_int_y = coords_raw.y - fract(coords_raw.y) ;
+
+vec2 domain_coords = vec2 (coords_raw.x - coord_int_x, coords_raw.y - coord_int_y);
+
+float domain_x = coords_raw.x - coord_int_x;
+
+domain_coords.y = clamp(domain_coords.y, 0.05, 0.95);
+
+domain_coords.x *=0.25;
+
+float shape_select = 0.0;
+
+if (domain_noise > 0.975) {shape_select = 0.25;}
+else if (domain_noise > 0.95) {shape_select = 0.5;}
+else if (domain_noise > 0.925) {shape_select = 0.75;}
+
+float t_fact = fract(osg_SimulationTime);
+
+if (t_fact > 0.75) {shape_select +=0.75;}
+else if (t_fact > 0.5) {shape_select +=0.5;}
+else if (t_fact > 0.25) {shape_select +=0.25;}
+
+
+domain_coords.x += shape_select;
+
+vec4 shapeTexel = texture2D(texture, domain_coords);
+
+color_base.rgb = mix(color_alt.rgb, color_base.rgb, length(shapeTexel.rgb)/1.73);
+
+if ((domain_coords.y < 0.1) || (domain_coords.y > 0.9)) {shapeTexel.a = 0.0;}
+if ((domain_x < 0.1) || (domain_x > 0.9)) {shapeTexel.a = 0.0;}
+
+domainTexel.rgb *= color_base.rgb;
+
+vec4 birdTexel;
+birdTexel.rgb = domainTexel.rgb * light_diffuse;
+birdTexel.a = domainTexel.a * shapeTexel.a * transmission;
+
+
+gl_FragColor = birdTexel;
+
+
+}
diff --git a/Shaders/birds-ALS.vert b/Shaders/birds-ALS.vert
new file mode 100644
index 000000000..f5c764eba
--- /dev/null
+++ b/Shaders/birds-ALS.vert
@@ -0,0 +1,48 @@
+// -*-C++-*-
+
+#version 120
+
+
+
+
+varying vec3 vertex;
+varying vec3 relPos;
+varying vec3 normal;
+
+uniform float osg_SimulationTime;
+
+void main()
+{
+
+vec4 ep = gl_ModelViewMatrixInverse * vec4(0.0,0.0,0.0,1.0);
+
+ vec4 l = gl_ModelViewMatrixInverse * vec4(0.0,0.0,1.0,1.0);
+ vec3 u = normalize(ep.xyz - l.xyz);
+
+ vec3 absu = abs(u);
+ vec3 r = normalize(vec3(-u.y, u.x, 0.0));
+ vec3 w = cross(u, r);
+
+vertex = gl_Vertex.xyz;
+relPos = vertex - ep.xyz;
+normal = gl_NormalMatrix * gl_Normal;
+
+ gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
+ gl_Position.xyz = gl_Vertex.x * u;
+ gl_Position.xyz += gl_Vertex.y * r;
+ gl_Position.xyz += gl_Vertex.z * w;
+
+ gl_Position = gl_ModelViewProjectionMatrix * gl_Position;
+
+//vec4 offset = gl_ModelViewProjectionMatrix * vec4 (0.05* osg_SimulationTime, 0.0, 0.0, 1.0);
+
+//gl_Position +=offset;
+
+//gl_Position = ftransform();
+gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
+
+gl_FrontColor = vec4 (1.0,1.0,1.0,1.0);
+gl_BackColor = gl_FrontColor;
+}
+
+