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authorAdrian Kummerlaender2019-09-25 21:55:01 +0200
committerAdrian Kummerlaender2019-09-25 21:55:01 +0200
commit95142dbc573d2792f021eb0eb7ae1c7cb96641b0 (patch)
tree9b7336d1dc790aff25c895cc1a44187761078699
parent191c425e06c040afc0e24fec9c854090fa032461 (diff)
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Use floats for texture storage, test curl visualization
Using `GL_RGBA32F` as the texture storage format instead of packing values into the unit interval.
-rw-r--r--channel_3d_volumetric_rendering_gl_interop.py51
-rw-r--r--template/opengl.mako2
-rw-r--r--utility/opengl.py4
3 files changed, 47 insertions, 10 deletions
diff --git a/channel_3d_volumetric_rendering_gl_interop.py b/channel_3d_volumetric_rendering_gl_interop.py
index efef0a2..91a470e 100644
--- a/channel_3d_volumetric_rendering_gl_interop.py
+++ b/channel_3d_volumetric_rendering_gl_interop.py
@@ -150,24 +150,63 @@ vec3 palette(float x) {
);
}
+vec3 blueBlackRedPalette(float x) {
+ if ( x < 0.5 ) {
+ return mix(
+ vec3(0.0, 0.0, 1.0),
+ vec3(0.0, 0.0, 0.0),
+ 2*x
+ );
+ } else {
+ return mix(
+ vec3(0.0, 0.0, 0.0),
+ vec3(1.0, 0.0, 0.0),
+ 2*(x - 0.5)
+ );
+ }
+}
+
+vec3 v(float x, float y, float z) {
+ return texture(moments, unit(vec3(x,y,z))).yzw;
+}
+
+vec3 curl(vec3 p) {
+ const float h = 1./$size_x;
+
+ const float dyvz = (v(p.x,p.y+1,p.z).z - v(p.x,p.y-1,p.z).z) / (2.0*h);
+ const float dzvy = (v(p.x,p.y,p.z+1).y - v(p.x,p.y,p.z-1).y) / (2.0*h);
+
+ const float dzvx = (v(p.x,p.y,p.z+1).x - v(p.x,p.y,p.z-1).x) / (2.0*h);
+ const float dxvz = (v(p.x+1,p.y,p.z).z - v(p.x-1,p.y,p.z).z) / (2.0*h);
+
+ const float dxvy = (v(p.x+1,p.y,p.z).y - v(p.x-1,p.y,p.z).y) / (2.0*h);
+ const float dyvx = (v(p.x,p.y+1,p.z).x - v(p.x,p.y-1,p.z).x) / (2.0*h);
+
+ return vec3(
+ dyvz - dzvy,
+ dzvx - dxvz,
+ dxvy - dyvx
+ );
+}
+
vec3 trace(vec3 pos, vec3 ray) {
const float ray_length = $max_ray_length;
const float delta = 1./ray_length;
vec3 color = vec3(0.0);
- float value = 0.0;
for (float t = 0.0; t < 1.0; t += delta) {
const vec3 sample_pos = unit(pos + t*ray_length*ray);
if (length(sample_pos) < sqrt(3.1)) {
const vec4 data = texture(moments, sample_pos);
if (data[3] != 1.0) {
- const float norm = length(data.yzw) / $inflow;
- value += delta * 0.5 * norm;
+ const vec3 c = curl(pos + t*ray_length*ray);
+
+ color += delta * blueBlackRedPalette(0.5+clamp(c.y,-1.0,1.0));
} else {
- const vec3 n = normalize(-0.5 + data.xyz); // recover surface normal
+ const vec3 n = data.xyz; // recover surface normal
const float brightness = clamp(dot(n, ray), 0, 1);
- color = vec3(max(0.3,brightness));
+ color += vec3(max(0.3,brightness));
break;
}
} else {
@@ -175,8 +214,6 @@ vec3 trace(vec3 pos, vec3 ray) {
}
}
- color += palette(value);
-
return color;
}
diff --git a/template/opengl.mako b/template/opengl.mako
index 50cdbbc..52699d5 100644
--- a/template/opengl.mako
+++ b/template/opengl.mako
@@ -115,7 +115,7 @@ __kernel void collect_gl_moments_to_texture(__global __read_only ${float_type}*
if (material_up != 5) { n.z = -1; }
if (material_down != 5) { n.z = 1; }
- data.xyz = 0.5 + 0.5*n; // pack surface normal into texture
+ data.xyz = normalize(n);
data.w = 1.0; // signal impermeable material to raytracer
}
diff --git a/utility/opengl.py b/utility/opengl.py
index afbfa00..ff88b17 100644
--- a/utility/opengl.py
+++ b/utility/opengl.py
@@ -75,7 +75,7 @@ class MomentsTexture:
glBindTexture(self.gl_texture_type, self.gl_moments)
if self.gl_texture_type == GL_TEXTURE_3D:
- glTexImage3D(self.gl_texture_type, 0, GL_RGBA, self.lattice.memory.size_x, self.lattice.memory.size_y, self.lattice.memory.size_z, 0, GL_RGBA, GL_FLOAT, self.gl_texture_buffer)
+ glTexImage3D(self.gl_texture_type, 0, GL_RGBA32F, self.lattice.memory.size_x, self.lattice.memory.size_y, self.lattice.memory.size_z, 0, GL_RGBA, GL_FLOAT, self.gl_texture_buffer)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(self.gl_texture_type, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
@@ -83,7 +83,7 @@ class MomentsTexture:
glTexParameteri(self.gl_texture_type, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE)
self.cl_gl_moments = cl.GLTexture(self.lattice.context, mf.READ_WRITE, self.gl_texture_type, 0, self.gl_moments, 3)
elif self.gl_texture_type == GL_TEXTURE_2D:
- glTexImage2D(self.gl_texture_type, 0, GL_RGBA, self.lattice.memory.size_x, self.lattice.memory.size_y, 0, GL_RGBA, GL_FLOAT, self.gl_texture_buffer)
+ glTexImage2D(self.gl_texture_type, 0, GL_RGBA32F, self.lattice.memory.size_x, self.lattice.memory.size_y, 0, GL_RGBA, GL_FLOAT, self.gl_texture_buffer)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(self.gl_texture_type, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)