CS 636 Programming Assignment 2 - Add diffuse/specular shading model with point lights

First Scene Setup

The camera for the scene is setup at (0,0,4) for the eye point, with a view direction of (0,0,-1) and a view up direction of (.3,1.0), normalized, to tilt the scene so it is not all right angles. The view plane distance is 6, and the horizontal camera angle is PI / 6.

The scene has two point light sources: a white light at (-5, 5, 5), and light source with color (0.4, 0.1, 0.3) rgb at position (-3, 20, 5).

The scene contains 5 objects: two spheres and three mesh objects including a flat shaded cube and a smooth shaded cylinder and finally a smooth shaded bunny.

The scene took 433 seconds to render on my PC laptop. Rerendering it on my Mac Mini M1 took only 15 seconds!.

Bunny

The bunny is translated along the z axis +2 to move it closer to the camera from the original mesh in "bound-bunny_200.smf". It is also rotated 45 degrees around the Y axis.

• Diffuse surface color of purple (r,g,b) = (0.7, 0.1, 0.6)
• Specular surface color of white (r,g,b) = (1,1,1)
• Ambient surface color of purple (r,g,b) = (0.7, 0.1, 0.6)
• Diffuse coefficient of 0.8.
• Specular coefficient of 0.5
• Ambient coefficient of 0.1
• Specular exponent of 2

First Sphere

The first sphere (on the right) is centered at (8, -2, -10) with a radius of 4.5.

• Diffuse surface color of medium blue (r,g,b) = (3/255, 83/255, 151/255)
• Specular surface color of white (r,g,b) = (1,1,1)
• Ambient surface color of white (r,g,b) = (1,1,1)
• Diffuse coefficient of 0.8.
• Specular coefficient of 0.4
• Ambient coefficient of 0.1
• Specular exponent of 5

Second Sphere

The second sphere (on the left) is centered at (-8, -2, -10) with a radius of 4.5.

• Surface color(diffuse,specular, and ambient) orange (r,g,b) = (232/255, 99/255, 10/255)
• Diffuse coefficient of 0.8.
• Specular coefficient of 0.1
• Ambient coefficient of 0.1
• Specular exponent of 1.5

Cube

The cube mesh object is translated from the original SMF model to translate it up (2.0) along the y axis. The cube is rendered with flat shading(without interplating normals).

• Surface color(diffuse,specular, and ambient) dark blue (r,g,b) = (0, 30/255, 108/255)
• Diffuse coefficient of 0.8.
• Specular coefficient of 0.1
• Ambient coefficient of 0.1
• Specular exponent of 2

Cylinder

The cylinder mesh object is translated from the original SMF model to translate it down (-2.0) along the y axis.

• Surface color(diffuse,specular, and ambient) of yellow (r,g,b) = (252/255, 217/255, 0)
• Diffuse coefficient of 0.8.
• Specular coefficient of 0.05
• Ambient coefficient of 0.05
• Specular exponent of 2

Original 1024 by 1024 Image

Smoothed 512 by 512 Image

Second Scene Setup

I added this scene to show better examples of specular highlights.

The camera for the scene is setup at (0,0,4) for the eye point, with a view direction of (0,0,-1) and a view up direction of (0, 1,0 ). The view plane distance is 6, and the horizontal camera angle is PI / 6.

The scene has two point light sources: a white light at (-5, 5, 5), and light source with color (0.4, 0.1, 0.3) rgb at position (13, 10, 5);

The scene contains 5 objects: two spheres and three mesh objects including a and a smooth shaded cylinder, a smooth shaded bunny, and a smooth shaded teddy bear.

Rendering it on my Mac Mini M1 took 192 seconds (much longer with teddy instead of cube from first scene).

Bunny

The bunny is translated along the z axis +2 to move it closer to the camera from the original mesh in "bound-bunny_200.smf". It is also rotated 45 degrees around the Y axis.

• Diffuse surface color of purple (r,g,b) = (0.7, 0.1, 0.6)
• Specular surface color of white (r,g,b) = (1,1,1)
• Ambient surface color of purple (r,g,b) = (0.7, 0.1, 0.6)
• Diffuse coefficient of 0.3
• Specular coefficient of 0.7
• Ambient coefficient of 0.01
• Specular exponent of 30

First Sphere

The first sphere (on the right) is centered at (8, -2, -10) with a radius of 4.5.

• Diffuse surface color of medium blue (r,g,b) = (3/255, 83/255, 151/255)
• Specular surface color of white (r,g,b) = (1,1,1)
• Ambient surface color of white (r,g,b) = (1,1,1)
• Diffuse coefficient of 0.8.
• Specular coefficient of 0.4
• Ambient coefficient of 0.1
• Specular exponent of 25

Second Sphere

The second sphere (on the left) is centered at (-8, -2, -10) with a radius of 2.

• Surface color(diffuse and ambient) of orange (r,g,b) = (232/255, 99/255, 10/255)
• Specular surface color of white (r,g,b) = (1,1,1)
• Diffuse coefficient of 0.3.
• Specular coefficient of 0.6
• Ambient coefficient of 0.1
• Specular exponent of 15

Cylinder

The cylinder mesh object is translated from the original SMF model to translate it down (-2.0) along the y axis.

• Surface color(diffuse,specular, and ambient) of yellow (r,g,b) = (252/255, 217/255, 0)
• Diffuse coefficient of 0.8.
• Specular coefficient of 0.05
• Ambient coefficient of 0.05
• Specular exponent of 2

The mesh for the teddy bear is translated by (-5, 4, -10), scaled by a factor of 0.15, and rotated around Y axis by PI / 4.

Teddy Bear

• Surface color (diffuse and ambient) dark blue (r,g,b) = (0, 30/255, 108/255)
• Specular surface color of white (r,g,b) = (1,1,1)
• Diffuse coefficient of 0.5
• Specular coefficient of 0.5
• Ambient coefficient of 0.1
• Specular exponent of 25