The Shading Course

Practice: ModFac Hunting

Lesson by

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Assignments 77Lesson NotesDownloads 3

Practice: ModFac Hunting

Lesson by

Dorian Iten

in The Shading Course

1.9K

Mark as Completed

Assignments 77Lesson NotesDownloads 3

Overview

Let's practice identifying modeling factors!

Materials Needed

The project files
Either a printer and colored pencils
Or your favorite image editing application such as Photoshop

Steps

Decide whether you'll do this assignment digitally or traditionally, and download the project files.
If you do it traditionally, you'll draw on the printout.
Identify and label all modeling factors by drawing an outline for each of them and coloring in the area. For "Ambient Light Intensity", estimate a percentage. 0% is no ambient light at all, 100% is extreme ambient light Intensity.
Upload your labelled image.

Duration

This project should take 30–60 minutes to complete. Start with the sphere and if you want to challenge yourself, do the monkey afterward.

Example

Maria Bygrove

•

3mo

Comparing to the solution file, I can see that I missed some reflected light on the monkey, and also I assigned the shadow inside the monkey's left eyebrow as form shadow rather than dark halftone.

Christian Zinser

•

4mo

I've been working on these; it's not as simple as it seems! I'll keep on working on this excercise but here is my submission.

@doublejon

•

4mo

I came back to do the pig version and graded myself. Looks like I forgot to add Ambient Occlusion on the legs of the pig as it's part of the core shadow and not just the cast shadow. My reflected light area wasn't big enough, so core shadow was way too big, and my guess on ambient light intensity was dead wrong at 10%. In conclusion, I need to pay more attention to reflected light, ambient light intensity, and ambient occlusion in future studies

@doublejon

•

5mo

Dedee Anderson Ganda

•

5mo

Aurora

•

6mo

Roland Karafa

•

9mo

There was a few factors i was unsure of it.

@rfrimpong3

•

1yr

I did it and graded myself lol but I have difficulties with some of them but I am mostly confused with Ambient light.

@maletu

•

1yr

I'm looking at the example given on the lesson page (sphere and torus), and thinking something is wrong about the way the dark area on the sphere under the top of the torus is treated. This dark area is marked as a cast shadow, and ambient occlusion is marked on it (as I believe correct), but its fuzzy edge is not identified as penumbra (as I believe it should be). AND its edge is also marked as a terminator; its bulk is marked as form shadow, and core shadow is marked on it—all of these incorrectly, IF it is a cast shadow). To be clear: it looks to me like the torus is casting a shadow on the sphere—the dark areas that wouldn't be there if the torus were taken away—and that this cast shadow has two edges: a fuzzy edge angled near the center of the sphere and a sharper edge near the lower right of the sphere. (Also, I'm intrigued why the sharper edge looks so sharp: my current theory is that the penumbra of the shadow is foreshortened.)

@marq777

•

1yr

The red and yellow for the sphere are my original guesses. The white/black Xs are the parts that I guessed wrong and the green are the parts that I missed.

Vin

•

1yr

Hello, these assignments are difficult as I thought, especially the monkey one, not sure about "center light" area. And how can I know the value of ambient light intensity, I compared with the video, it looks about the same (maybe). And I have one question, is "form shadow = reflected light + core shadow" ? or is there some halftone between? 🤔 I appreciate any feedback, thank you.

Dorian Iten

•

1yr

> "form shadow = reflected light + core shadow": that's how I think about it. 👍 Halftones are on the other side of the terminator.

Martha Muniz

•

1yr

If we are thinking about the terminator dividing the object into the side of light and the side of shadow, the form shadow refers to this general grouping on the shadow side. Core shadow, reflected light, and ambient occlusion are more specific terms referring to parts that make up that shadow region. As for your answer sheet, it looks pretty spot on! The only thing I would note is that the dark halftones are more contained to a smaller portion as they transition into the lighter halftones. A smaller detail, but it's good to be aware of it, especially as this change can happen pretty quickly under strong/direct lighting.

@kotka

•

1yr

This was a way more challenging exercise than it first appeared. Grateful for critique because I'm quite unsure in several areas, especially the difference between dark halftones and center light.

@kotka

•

1yr

I went back a few days later to repeat and did the extra. For some reason, this was easier in some ways but harder in others. With the glossy surface and increased ambient light, I'm not sure I completely got it. If anyone solved this, too, please reach out!

Derek Adams

•

2yr

Martha Muniz

•

2yr

Nice! Just a few things to keep in mind: - The core shadow will typically be more along the same lines as the terminator. - The dark halftones will be a smaller area, the area of shadow before other factors (ie reflected light) take effect. - Reflected light affects any area near another surface receiving light, so this will also affect the left cheek, jaw, and eye/note bumps to varying degrees (depending on the strength of light coming from the nearby surface). - The highlight in this scenario will be more limited, still in the same areas you correctly marked, just smaller. The surface texture of the monkey appears matte, so that will limit the amount of reflectivity to create a highlight. - Ambient occlusion will also affect any crevice with a pocket of shadow, not just between the object and ground. You can find some areas around the eye surface crevices, and the nose/ear/mouth bumps. These may be smaller corrections, but understanding the components of light both separately and how they work together early on can really help in the long run once you enter more complex subjects, as even the most masterful and complicated scenes build on top of these principles. Happy drawing and I hope this helps!

Samuel Sanjaya

•

2yr

my modfac hunting assingments. distinguishing between center light and halftones is pretty hard for me. any feedbacks will be appreciated

Pitt Pauly

•

2yr

Pitt Pauly

•

2yr

My attempt of drawing the modelling factors with the example white ball. I found it quite hard to make the ball appear white while also differentiating the shadow mid-tones and the darkest cast shadow. Critique welcome!