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[Flightgear-commitlogs] [FGData] 01/01: Procedural thruster flames, work in progress
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From: <fli...@li...> - 2015-05-21 08:25:37
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commit 44f8e5f6724af3258a71fab2b9234b0cd355c56a
Author: Thorsten Renk
Date: Thu May 21 11:28:21 2015 +0300
Procedural thruster flames, work in progress
---
Aircraft/Generic/Effects/Thruster/thrust_flame.ac | 61 ++++++++
Effects/thrust-flame.eff | 171 +++++++++++++++++++++
Shaders/thrustflame-ALS.frag | 124 +++++++++++++++
Shaders/thrustflame-ALS.vert | 19 +++
4 files changed, 375 insertions(+), 0 deletions(-)
diff --git a/Aircraft/Generic/Effects/Thruster/thrust_flame.ac b/Aircraft/Generic/Effects/Thruster/thrust_flame.ac
new file mode 100644
index 0000000..298a6e5
--- /dev/null
+++ b/Aircraft/Generic/Effects/Thruster/thrust_flame.ac
@@ -0,0 +1,61 @@
+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 0.5000
+MATERIAL "Material" rgb 0.8000 0.8000 0.8000 amb 1.0000 1.0000 1.0000 emis 0.0000 0.0000 0.0000 spec 0.5000 0.5000 0.5000 shi 50 trans 0.5000
+OBJECT world
+name "Blender_export__cube.ac"
+kids 1
+OBJECT poly
+name "Bounding_box"
+numvert 8
+5.0 -1.0 -1.0
+5.0 -1.0 1.0
+0.0 -1.0 1.0
+0.0 -1.0 -1.0
+5.0 1.0 -1.0
+5.0 1.0 1.0
+0.0 1.0 1.0
+0.0 1.0 -1.0
+numsurf 6
+SURF 0X20
+mat 1
+refs 4
+0 0 0
+1 0 0
+2 0 0
+3 0 0
+SURF 0X20
+mat 1
+refs 4
+4 0 0
+7 0 0
+6 0 0
+5 0 0
+SURF 0X20
+mat 1
+refs 4
+0 0 0
+4 0 0
+5 0 0
+1 0 0
+SURF 0X20
+mat 1
+refs 4
+1 0 0
+5 0 0
+6 0 0
+2 0 0
+SURF 0X20
+mat 1
+refs 4
+2 0 0
+6 0 0
+7 0 0
+3 0 0
+SURF 0X20
+mat 1
+refs 4
+4 0 0
+0 0 0
+3 0 0
+7 0 0
+kids 0
diff --git a/Effects/thrust-flame.eff b/Effects/thrust-flame.eff
new file mode 100644
index 0000000..f6bc854
--- /dev/null
+++ b/Effects/thrust-flame.eff
@@ -0,0 +1,171 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<PropertyList>
+ <name>Effects/thrust-flame</name>
+
+<parameters>
+ <texture n="0">
+ <type>white</type>
+ </texture>
+ <thrust_collimation>0.1</thrust_collimation>
+ <thrust_density>0.5</thrust_density>
+ <shock_frequency>0.5</shock_frequency>
+ <noise_strength>0.2</noise_strength>
+ <noise_scale>0.1</noise_scale>
+ <flame_color_low_r type="float">0.95</flame_color_low_r>
+ <flame_color_low_g type="float">0.55</flame_color_low_g>
+ <flame_color_low_b type="float">0.0</flame_color_low_b>
+ <flame_color_high_r type="float">1.0</flame_color_high_r>
+ <flame_color_high_g type="float">0.8</flame_color_high_g>
+ <flame_color_high_b type="float">0.3</flame_color_high_b>
+ <use_shocks type="int">1</use_shocks>
+ <use_noise type="int">1</use_noise>
+</parameters>
+
+<technique n="4">
+ <predicate>
+ <and>
+ <property>/sim/rendering/shaders/skydome</property>
+ <or>
+ <less-equal>
+ <value type="float">2.0</value>
+ <glversion/>
+ </less-equal>
+ <and>
+ <extension-supported>GL_ARB_shader_objects</extension-supported>
+ <extension-supported>GL_ARB_shading_language_100</extension-supported>
+ <extension-supported>GL_ARB_vertex_shader</extension-supported>
+ <extension-supported>GL_ARB_fragment_shader</extension-supported>
+ </and>
+ </or>
+ </and>
+ </predicate>
+ <pass>
+ <lighting>true</lighting>
+ <material>
+ <active><use>material/active</use></active>
+ <ambient><use>material/ambient</use></ambient>
+ <diffuse><use>material/diffuse</use></diffuse>
+ <specular><use>material/specular</use></specular>
+ <emissive><use>material/emissive</use></emissive>
+ <shininess><use>material/shininess</use></shininess>
+ <color-mode><use>material/color-mode</use></color-mode>
+ </material>
+ <blend>
+ <active><use>blend/active</use></active>
+ <source><use>blend/source</use></source>
+ <destination><use>blend/destination</use></destination>
+ </blend>
+ <shade-model><use>shade-model</use></shade-model>
+ <cull-face><use>cull-face</use></cull-face>
+ <rendering-hint><use>rendering-hint</use></rendering-hint>
+ <render-bin>
+ <bin-number>111</bin-number>
+ <bin-name>DepthSortedBin</bin-name>
+ </render-bin>
+ <texture-unit>
+ <!-- The texture unit is always active because the shaders expect
+ that. -->
+ <unit>0</unit>
+ <active><use>texture[0]/active</use></active>
+ <type><use>texture[0]/type</use></type>
+ <image><use>texture[0]/image</use></image>
+ <filter><use>texture[0]/filter</use></filter>
+ <wrap-s><use>texture[0]/wrap-s</use></wrap-s>
+ <wrap-t><use>texture[0]/wrap-t</use></wrap-t>
+ <internal-format> <use>texture[0]/internal-format</use> </internal-format>
+ </texture-unit>
+ <depth>
+ <write-mask>false</write-mask>
+ </depth>
+ <vertex-program-two-side>false</vertex-program-two-side>
+ <program>
+ <vertex-shader>Shaders/thrustflame-ALS.vert</vertex-shader>
+ <fragment-shader>Shaders/thrustflame-ALS.frag</fragment-shader>
+ <fragment-shader>Shaders/noise.frag</fragment-shader>
+ </program>
+
+ <uniform>
+ <name>thrust_collimation</name>
+ <type>float</type>
+ <value><use>thrust_collimation</use></value>
+ </uniform>
+ <uniform>
+ <name>thrust_density</name>
+ <type>float</type>
+ <value><use>thrust_density</use></value>
+ </uniform>
+ <uniform>
+ <name>shock_frequency</name>
+ <type>float</type>
+ <value><use>shock_frequency</use></value>
+ </uniform>
+ <uniform>
+ <name>noise_strength</name>
+ <type>float</type>
+ <value><use>noise_strength</use></value>
+ </uniform>
+ <uniform>
+ <name>noise_scale</name>
+ <type>float</type>
+ <value><use>noise_scale</use></value>
+ </uniform>
+ <uniform>
+ <name>flame_color_low_r</name>
+ <type>float</type>
+ <value><use>flame_color_low_r</use></value>
+ </uniform>
+ <uniform>
+ <name>flame_color_low_g</name>
+ <type>float</type>
+ <value><use>flame_color_low_g</use></value>
+ </uniform>
+ <uniform>
+ <name>flame_color_low_b</name>
+ <type>float</type>
+ <value><use>flame_color_low_b</use></value>
+ </uniform>
+ <uniform>
+ <name>flame_color_high_r</name>
+ <type>float</type>
+ <value><use>flame_color_high_r</use></value>
+ </uniform>
+ <uniform>
+ <name>flame_color_high_g</name>
+ <type>float</type>
+ <value><use>flame_color_high_g</use></value>
+ </uniform>
+ <uniform>
+ <name>flame_color_high_b</name>
+ <type>float</type>
+ <value><use>flame_color_high_b</use></value>
+ </uniform>
+
+
+ <uniform>
+ <name>use_shocks</name>
+ <type>int</type>
+ <value><use>use_shocks</use></value>
+ </uniform>
+ <uniform>
+ <name>use_noise</name>
+ <type>int</type>
+ <value><use>use_noise</use></value>
+ </uniform>
+
+
+
+ <uniform>
+ <name>texture</name>
+ <type>sampler-2d</type>
+ <value type="int">0</value>
+ </uniform>
+ <uniform>
+ <name>colorMode</name>
+ <type>int</type>
+ <value><use>material/color-mode-uniform</use></value>
+ </uniform>
+ </pass>
+ </technique>
+
+</PropertyList>
diff --git a/Shaders/thrustflame-ALS.frag b/Shaders/thrustflame-ALS.frag
new file mode 100644
index 0000000..9520031
--- /dev/null
+++ b/Shaders/thrustflame-ALS.frag
@@ -0,0 +1,124 @@
+// -*-C++-*-
+
+
+varying vec3 vertex;
+varying vec3 viewDir;
+
+uniform float osg_SimulationTime;
+uniform float thrust_collimation;
+uniform float thrust_density;
+uniform float shock_frequency;
+uniform float noise_strength;
+uniform float noise_scale;
+
+uniform float flame_color_low_r;
+uniform float flame_color_low_g;
+uniform float flame_color_low_b;
+
+uniform float flame_color_high_r;
+uniform float flame_color_high_g;
+uniform float flame_color_high_b;
+
+uniform int use_shocks;
+uniform int use_noise;
+
+float Noise3D(in vec3 coord, in float wavelength);
+float Noise2D(in vec2 coord, in float wavelength);
+
+const int n_steps = 100;
+
+float spherical_smoothstep (in vec3 pos)
+{
+
+float noise = Noise3D(vec3(pos.x - osg_SimulationTime * 5.0 , pos.y, pos.z), 0.3);
+
+pos *=4.0;
+
+pos.x *=0.5;
+float d = length(pos);
+
+
+
+return 3.0 * (1.0 - smoothstep(0.3, 0.7, d)) /float(n_steps)* (0.5 + 0.5 * noise);
+}
+
+float spherical_smoothstep1 (in vec3 pos)
+{
+pos.x *=0.2;
+float d = length(pos);
+
+return 1.0 * (1.0 - smoothstep(0.3, 0.7, d)) /float(n_steps);
+}
+
+float thrust_flame (in vec3 pos)
+{
+
+
+//float noise = Noise3D(vec3(pos.x - osg_SimulationTime * 20.0 , pos.y, pos.z), 0.3);
+float noise = Noise2D(vec2(pos.x - osg_SimulationTime * 30.0 , length(pos.yz)), noise_scale);
+
+float d = 1.0 - pos.x/2.5 ;
+float radius = 0.2 + thrust_collimation * 1.4 * pow((pos.x+0.1),0.5);
+
+d *= (1.0 - smoothstep(0.125, radius, length(pos.yz))) * (1.0 - noise_strength + noise_strength* noise);
+
+if (use_shocks == 1)
+ {
+ float shock = sin(pos.x * 20.0 * shock_frequency);
+ d += shock * shock * shock * shock * (1.0 - pos.x/2.5) * (1.0 - smoothstep(0.05, 0.1, length(pos.yz))) * (1.0 - smoothstep(0.0, 1.0, thrust_collimation));
+ }
+
+return 10.0 * thrust_density * d / (radius/0.2);
+}
+
+
+
+void main()
+{
+
+float t_x = 2.0 * abs(vertex.x) / max(viewDir.x, 0.0001);
+float t_y = 2.0 * abs(vertex.y) / max(viewDir.y, 0.0001);
+float t_z = 2.0 * abs(vertex.z) / max(viewDir.z, 0.0001);
+
+float t_min = min(t_x, t_y);
+t_min = min(t_min, t_z);
+
+t_min = 5.0;
+
+float dt = t_min / float(n_steps);
+
+vec3 step = viewDir * dt;
+vec3 pos = vertex;
+
+float density1 = 0.0;
+float density2 = 0.0;
+
+
+
+for (int i = 0; i < n_steps; i++)
+ {
+ pos = pos + step;
+ if ((pos.x > 5.0) || (pos.x <0.0)) {break;}
+ if ((pos.y > 1.0) || (pos.y <-1.0)) {break;}
+ if ((pos.z > 1.0) || (pos.z <-1.0)) {break;}
+ //density1 += spherical_smoothstep(pos);
+ //density2 += spherical_smoothstep1(pos);
+ density2 += thrust_flame(pos) * dt;
+ }
+
+
+
+
+float density = density1 + density2;
+density = clamp(density,0.0,1.0);
+
+
+vec3 flame_color_low = vec3 (flame_color_low_r, flame_color_low_g, flame_color_low_b);
+vec3 flame_color_high = vec3 (flame_color_high_r, flame_color_high_g, flame_color_high_b);
+
+vec3 color = mix(flame_color_low, flame_color_high, density2+density1);
+
+vec4 finalColor = vec4 (color.rgb, density);
+
+gl_FragColor = finalColor;
+}
diff --git a/Shaders/thrustflame-ALS.vert b/Shaders/thrustflame-ALS.vert
new file mode 100644
index 0000000..c0668e3
--- /dev/null
+++ b/Shaders/thrustflame-ALS.vert
@@ -0,0 +1,19 @@
+// -*-C++-*-
+
+varying vec3 vertex;
+varying vec3 viewDir;
+
+void main()
+{
+
+vec4 ep = gl_ModelViewMatrixInverse * vec4(0.0,0.0,0.0,1.0);
+
+vertex = gl_Vertex.xyz;
+viewDir = normalize(vertex - ep.xyz);
+
+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;
+}
--
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