【COM6503】Computer Graphics

1. Introduction

Reality in computer graphics encompasses various approaches. Examples include photorealism, such as whether we can discern between a rendered image and an actual one, behavior realism within simulations involving the authenticity of human motion and realistic skin reactions, and interaction realism demonstrated by accurate responses to dropping objects from elevated positions.

Upon compression, does the material deform? Additionally, is the functional behavior clearly defined regardless of the rendering method?

This assignment focuses on a specific element within photorealism: achieving rendered surfaces that appear less pristine. I observe the surfaces and objects surrounding me; I notice dustiness; dirtiness; scratches; dents across various surfaces; as well as signs of wear-and-tear leading to an aged appearance. I believe you can easily imagine other instances. But how are these aged appearances generated in computer-generated renderings? This study focuses on utilizing texture-mapping techniques to create more realistic-looking renderings.

Learning Outcomes

This assignment addresses the following module learning outcomes:

Evaluate various methods to enhance the visual fidelity of rendered images.

Provide a summary of relevant information related to a specific topic in computer graphics and evaluate it.

2. The report

Structure

The report should begin with a brief overview of the broader subject matter and your rationale underpinning the structure.

This section will be followed by additional subsections that will systematically organize the components of your report. The composition of this report is entirely up to you, as you determine which sections to include and the order in which they should be presented.

• The report should finish with a short conclusions section.

• The report must be illustrated as described in the next section.

Illustrations

These are crucial components of the report – they must be essential to the discussion, avoiding any side issues. It is imperative that these illustrations are included in the discussion. Their relation to the discussion will be considered during marking.

The following must be included:

Screenshots taken in Assignment 1: In your report, it is required to include three or more screenshots taken in Assignment 1. These images should showcase modifications made to your program in Assignment 1 to create a less polished rendering. Examples of such modifications could include adding realistic dirt spots to an alien’s clothing using texture mapping techniques, or applying diffuse and specular textures to simulate a weathered appearance on security lamps. Additionally, incorporating extra objects with visible imperfections is optional but encouraged. Ensure that each modification is distinct and clearly described. Your submission must feature at least three unique changes. Illustrate this by showing before-and-after screenshots for each modification, along with details of the texture maps incorporated into your program and how they were applied to achieve the desired effects.]

Photographs of the real world: You are required to capture three high-quality images from everyday life that depict objects or scenes with visible dirt and weariness. These will be incorporated into your report as illustrative examples. Additionally, you can capture close-ups or focus on specific details within these photos if feasible. Aim to capture images featuring similar aspects as those encountered in Assignment 1—for instance, images showing dirt spots on clothing. This will enable you to compare these authentic images with their simulated counterparts by utilizing texture maps.

利用商业软件创建插图：为了生成非完美渲染效果，请至少制作三幅插图，并学习如何利用免费的商业软件（如Unity或Blender）来实现这一目标——这两款软件均为学生提供免费版本。这些插图可能是具有非完美渲染效果的对象实例。然后描述产生这些非完美渲染效果所使用的技巧。如果这些技巧在‘作业1中的屏幕快照’中提供了更好的实例，则可以进一步讨论。

Additionally, it is advisable to incorporate some illustrative elements from my lecture notes and online resources. Nevertheless, prior to utilizing materials from the Internet, it is imperative to verify copyright clearance.

Things to consider

This section lists some items that may be considered when writing a report.

• At some point in your report, you might consider the language and terminology you will use to refer to old, worn, dirty, aged objects and scenes. What kinds of imperfection might be considered? What does it mean to be not pristine? What might cause something to be not pristine? Misuse? Time? Interaction with other objects? Some other reason? Is it important to consider the cause of an effect? Put your personal, individual ideas into this – what do you see when you look around at indoor and outdoor spaces that you know?

This study focuses on texture-mapping approaches for rendering less pristine scenes. What are the capabilities and limitations of texture-mapping approaches?

一个值得考虑的方面是如何控制技术以产生非理想表面。例如，在应用不完美时如何进行控制？是人工密集型的手工过程还是可以通过某种方式自动化？这方面的考量可能涉及探讨因果关系（即程序是否可以根据某些交互自动添加不完美）以及艺术控制（如果程序决定不完美，则艺术控制是否会受到影响）。此外，请问时间是否是考虑因素之一？即不完美随时间的变化情况如何？