Non Photorealistic Shading:
Simian Virus
The goal of this project is to recreate geometries that are intended to mimic the "look" of images recorded by a scanning electron microscope. Rendered using the PxrOcclusion integrator, my scene is shaded through the use of Open Shading language and "lit" from procedural shading techniques.
Final Renders
Camera Depth of Field Test
Directional "Light" Test
Reference
Electronic Microscope image of the simian virus is used as a reference and inspiration for this project. Noticeably, the virus pathogen has a unique cauliflower shape. (Some artistic refining were taken in order to enhance the look of the final product.)
Basic Geometry
- rendered using PxrVisualizer Integrator -
OSL Shading Process
A. Edge Node
shader
SEM_502_Edge
[[
int rfm_nodeid = 11,
string rfm_classification = "rendernode/RenderMan/pattern",
string help = "Brief description goes here."
]]
(
color base = 1,
color edge = color(1,0,0),
float strength = 1,
output color resultRGB = 0,
output float resultF = 0)
{
vector i = normalize(I);
vector n = normalize(N);
float angle = 1 - fabs(dot(n, -i));
resultRGB = mix(base, edge, pow(angle, strength));
resultF = angle - 0.5;
}
B. Noise Node
shader
SEM_502_Noise
[[
int rfm_nodeid = 12,
string rfm_classification = "rendernode/RenderMan/pattern",
string help = "Brief description goes here."
]]
(
string spacename = "object",
float freq = 0.5,
int octaves = 3,
int creases = 0,
output float resultF = 0)
{
point p = transform(spacename, P);
int n;
float result;
float F = freq;
float amplitude = 1;
for(n = 0; n < octaves; n++) {
result = noise("perlin", p * F)/amplitude;
resultF += result;
F *= 2;
amplitude *= 2;
}
if(creases > 0)
resultF = 1 - abs(resultF);
}
C. Hilite Node
shader
SEM_Hilite(
color base = 1,
color edge = color(1,0,0),
float strength = 1,
vector hilite_direction = vector(0,0,-1),
string spacename = "world",
output color resultRGB = 0)
{
vector dir = transform(spacename, hilite_direction);
vector hd = normalize(dir);
vector n = normalize(N);
float d = fabs(dot(n, -hd));
resultRGB = mix(base, edge, pow(d, strength));
}
