In this assignment, you'll start taking your shading skills to the next level by understanding Ambient Occlusion (AO) at a deeper level.
Materials Needed
The project image.
A red colored pencil, or a digital painting application.
Steps
Download the project file and A) print it out or B) open it in your preferred digital painting application.
Assuming diffuse light from the sky, indicate in red where you think the occlusion shadows are. Lighter red = less occlusion, darker red = more occlusion.
When you’re done, check the solutions included in the ZIP file. It contains: A 2D solution with ambient occlusion intensity in red. A 3D render to show you where occlusion occurs and better understand the reasoning behind the red areas in the 2D solution.
Duration
This project should take 15–30 minutes to complete.
Notes
This assignment has evolved over the years, so student submissions below might vary.
I graded myself and I have question please from the notes above, is it implying that only ambient light have Occlusion shadow? Because I thought direct light can also have occlusion shadow in its scene.
I think shadows created by direct light are called "form shadow" or "cast shadow". In this assignment we look at AO, and AO refers to "Ambient Occlusion", specifically focusing on the shadows created by ambient light.
Not sure if I'm missing something but I found no 3D version of the worksheet, only a 2D. I see a lot of people here post a 3D version...
I feel that AO is a lot easier to understand intuitively than core shadow.
My attempt and the fix after seeing the solution. I wonder why the box concave part has shadows in it? I thought the light source suppose to come from above.. Any feedbacks will be greatly appreciated..
I did this for this exercise on ambient occlusion and after watching the solution, I am a bit confused, especially about the cube. Like I don't understand why the hole on top should be so dark and why the occlusion shadow spreads so widely on the base plane :/ Maybe watching the modules feedback will help
I did the simple ao assignment in graphite, on computer-print out paper. I assumed there was a lot of ambient light, thereby making the shading and shadow very subtle. I actually broadened the occlusion shadow in this, my 2nd version. (I didn't spread the shadow beyond the circumference of the objects in my first draft). The paper got a bit crinkly when I did this. I had trouble imagining a shadow around the base of the cube, considering light would be flowing all around the object and it was flush with the surface plane.
After watching Module 2 review, I modified my drawing and added a bit more occlusion shadow to the forms. Its still subtle, but I think its much better.
Here is my simple AO study assignment done in graphite.
J haven’t checked the solution yet, but I do feel confident in my thought process.
the cube being close, (touching) the floor plane would be quite dark occlusion but with nothing else blocking ambient light from above, the side planes should stay fairly consistent. The planes in the indentation will likely receive less ambient light as they are in a tighter space exposed to less AL. Also the planes are much smaller therefore will appear to the eye to be darker relative the larger side planes.
the cyclinder and the sphere were much simpler to think about, though I should check the solution before O get too confident….
Revised after going over the solution. In the box, I missed the cast shadows that are sort of tapered due to the multiple directions of light casting shadows from different angles. I also didn’t account for how much “coverage” AO contributes to the shadows. I’m glad this exercise revealed that me.
Also so I can see it in life, I set up a test study subject at work where we have multiple light sources from high up ceiling lamps and skylights and windows as well as white peg board walls. You can see the shadows cast in multiple directions and the inside “walls” of the tape are quite dark.
Former program director at Barcelona Academy of Art. Passionate about teaching craft and exploring the inner game of art.
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Overview
In this assignment, you'll start taking your shading skills to the next level by understanding Ambient Occlusion (AO) at a deeper level.
Materials Needed
Steps
Duration
This project should take 15–30 minutes to complete.
Notes
This assignment has evolved over the years, so student submissions below might vary.