Thursday, 25 February 2016

Graphics Work

A quick update on what I've been working on recently.

For one of my modules Simulations and 3D Graphics, we were set a task to learn lighting and materials. So far I have implemented a single light, using ADS and blinn-phong (again).

The camera can rotate, move forward/backward. The armadillo can be rotated on it's pedestal and the whole scene can be rotated.

Sunday, 7 February 2016

Project 5: Stanford dragon rendering

This dragon is one of the many models which the Stanford University Computer Graphics Laboratory scanned. More info I used this to practice for an upcoming module, it is made in OpenTK and uses OpenGL 4.5.
Work for this included:
  • Loading vertex and normal data from .OBJ.
  • Parsing material file for Blinn-Phong attributes.
  • Blinn-Phong glsl shaders.
  • Setting model/view/projection matrices.
  • Configuring camera and light positions.

Tuesday, 2 February 2016

Project 4: Ray casting with a 2d graphics library.

Implementing this using one of my favorite frameworks ( in Lua was a lot of fun!

This is heavily inspired by Wolfenstein 3D.

It involved simple trigonometry, calculating ray/shape intersections, figuring out how to map textures and lighting effects.

A problem I encountered was a fisheye lens effect, because for each ray projected into the world, I would map the intersection distance directly to the height a wall (which is a group of line slices). However what I needed to do was calculate the perpendicular distance of the intersection using the projection plane as a reference.

Fish-lens effect

Here's a great image which helped me understand the problem a lot, originally my raycasting method resembled the one of the far right.

Here are the resources I used:
  • - Help with the projection plane/intersection distance calculation.
  • - How I map the texture coordinates onto the side of a shape given a set of intersections with it.

OOP - Recovering lost class types

 Normally casting is used to convert classes to other classes, however this operation can break the type system. For example, a "List&q...