HW9 - Sphere Ray Tracer 1

I made a class called Canvas_RT to do all of my ray tracing for me. Shadows are implemented. To shade an object I keep a tbuffer rather than a zbuffer, which stores the time it took for the ray to hit the object, and I use Phong's reflectance algorithm. I determine if a shaded point P is in shadow with respect to light L by ray tracing from P outwards in the direction of L and checking if the ray hits any other spheres.

I added couple of basic helper methods to my Light and Material classes.

Applet

• [ UP / DOWN ] - change rotation angle of white sphere
• [ LEFT / RIGHT ] - select the next sphere (white)
• [ space ] - reset all rotation angles to random
• [ q w e a s d ] - change direction of light
• [ - = ] - zoom out / in

Applet - Ray Tracer

EDIT: added subsampling for massive speedup and added anti-aliasing

• [ 1 ] - show ray traced pixels (subsampling)
• [ 2 ] - show anti-aliased pixels
• [ 3 ] - toggle anti-aliasing

NEW Applet

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HW9_Package.zip
HW9_szymczak.java
Canvas_RT.java

HW8 - Materials and Phong's Reflectance

I got tired of copying-and-pasting my drawing code from one HW to the next so I created a Canvas class that does all of it for me. The pipeline is the same as for HW7.

• renderShape(Geometry shape) : splits each face into triangles and performs transform on vertices and normals.
• renderTriangle() : calculates area of the triangle, and renders accordingly by calling methods below
• vertexData() : calculates pixels, depth, and colors at A, B, C, and D. Vertex A is oriented on top; D-B in the middle; C on the bottom.
• fillTriangle(int[] vertex, double[] color, double depth) : parameters give data for the apex of the triangle (either A or C).
• interpolate(double fraction, double[] a, double[] b) : linearly interpolate fraction along the way between a and b.
• phong(double[] color) : Phong's color reflectance algorithm
• gamma(double[] color) : Gamma correction

I added a bunch of helper methods to my Matrix class -- operations on arrays. In the .java file they are grouped together.

• add, subtract, cmult, dot, normalize, copy, copyCol

I also added a Light class that simply stores data for a light and a Material class that stores the relevant values to mimic a material. Each Geometry object has a Material object as a class variable.

Applet

• [ arrow keys ] - rotation
• [ . / ] - zoom out and in
• [ space ] - pause rotation

Click for Applet

It's kind of boring but I didn't have time to create a fun game this week.

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HW8_package.zip
HW8_szymczak.java
Canvas.java
Material.java
Light.java
Matrix.java
Geometry.java