Interactive Graphics Homework #01s

First things first, Setup

I created the cube to rotating -by increasing/decreasing value of theta- around X-axis by default, however, this can be manipulated using different buttons specifying the axis of rotation, as well as, toggling rotation, all was implemented inside the render() function.
Model viewing and projection calculations were implemented using lookAt() functionality implemented in one of the scripts provided MV.js
Viewer position which is referred to as eye is controlled in three different axes, which are needed to calculate the model view matrix.

Scale the cube and translate them, as requested was done using range sliders, and the corresponding values -as per slider- were used by the transformation matrices, the ones I constructed using rotate(), translate(), scalem(), of course to perform rotation, translation, scaling. All of them were multiplied to CTM using mult().
All of the mentioned functions are from MV.js, as well.

As per the requirements, I implemented 2 projections perspective perspective(), as well as, orthogonal orth().
Added to range sliders to control Near & Far planes, not to mention that, they control both projections

To project two different views -each in a separate half-, I needed to split our canvas vertically which was done using gl.scissor() with gl.viewport() hand in hand. Each of the projections are controlled using the same range sliders.

I introduced directional white colored point light source, specifying its intensity and position, in addition to, the ambient light illuminating the whole canvas. Object shading depends on the orientation of the faces with respect to the light source, thus, I needed to compute normal vector as per each vertex inside the function named quad() which basically calculates the cross product of 2 vectors laying on the same face.

I used two shading models Phong & Gouraud, both were implemented using Vertex and Fragment shaders. Phong interpolates the normal across the triangle and compute color as per fragment unlike Gouraud, which computes the color between each vertex and interpolates it. How I applied the different shading models? By multiplication of ambient, diffuse, specular properties of light with properties of material, as well as, taking into consideration both shining property of the material, added to, light position.