1. WYSIWYG NPR: Drawing Strokes Directly on 3D Models Paper by: Robert D. Kalnins, Lee Markosian, Barbara J. Meier, Michael A. Kowalski, Joseph C. Lee, Philip L. Davidson, Matthew Webb, John F. Hughes and Adam Finkelstein. Presentation by: Nathan F. Cantelmo

2. Table of Contents ● WYSIWYG NPR Overview ● Interface Descriptions ● Rendering System & Shaders ● Stroke Styles & Features ● Hatching & LOD Methods ● Summary & Conclusions ● Points for Discussion

3. WYSIWYG NPR Overview ● What is WYSIWYG NPR? ● How does it work? ● Who should use it? ● What purpose does it serve?

4. Interface Descriptions ● Tablet, mouse, or keyboard used for input ● Three editing modes: ● Line editing mode ● Hatching editing mode ● Basecoat editing mode

5. Line Editing Mode

6. Hatching Editing Mode

7. Basecoat Editing Mode

8. Rendering System & Shaders ● Triangle mesh used for models ● Mesh divided into patches ● Each patch rendered by four shaders: ● Background and base coat shader ● Stroke formation shader ● Stroke visibility shader ● Media simulation shader

9. Rendering System & Shaders

10. Stroke Styles & Features ● Four types of strokes: ● Decal strokes ● Crease strokes ● Silhouette strokes ● Hatching strokes

11. Stroke Styles & Features

12. Hatching & LOD Methods ● Two types of hatching: ● Fixed hatching ● Mobile hatching ● Two types of LOD control: ● Structured hatching ● Free hatching

13. Hatching & LOD Methods

14. Summary & Conclusions ● Strengths of WYSIWYG NPR ● Weaknesses of the system ● Continuing work: ● Jot ● Coherent Stylized Silhouettes

15. Points for Discussion ● How might the stroke visibility algorithm be improved? ● Could individual silhouettes be annotated uniquely? ● What other, unmentioned shortcomings exist? ● Other questions, comments, etc.