- Interactive 3D Sketch Pad -
Sangyoon Lee (s.james.lee @ me.com)
Electronic Visualization Laboratory
University of Illinois at Chicago
3.D.UO.PAD is a real-time interactive 3D drawing and carving art piece in the CAVE (Cave Automatic Virtual Environment). This project aims to give a user the conception of the relationship between color and 3 dimensional shapes.
Selected as Best Work in Virtual Reality Environments session, Indiana IDEAS Festival 2005.
The main input factor is the color on the PAD. From the variety of the intensity of colors in painting, we interpret them into another meaning, the depth - one of the most dominant core components of 3D geometry. This idea primarily bases on the shading of the objects in the real world. When we see objects, we distinguish their depth and shapes by the brightness of each face which is produced by lighting. This is not only one way to recognize 3D object but one to make a feature of it.
The creativity exists not just in the author’s realm anymore, but in the individual audiences, who are encouraged to visualize their ideas, to interact with, and to collaborate with others by transforming the creativity through the 3.D.UO.PAD. Since we are not in the linear story, you do create your own experience and vision in the artificial environment that is aided by computers.
3.D.UO.PAD is composed of main stage and three sub spaces, such as color space, texture room, and archiving room.
Demo Video (7:23)
[Figure1.] Main Stage
Most of interactions occur in this stage. A user manipulates the virtual sketchpad. There are several user interfaces for selecting brush color, changing brush size, and menu system to command various functions of 3.D.UO.PAD, such as texturing, brush type, several deform patterns and so on. Walls of the stage were built up with two distinguished cubes; black and white. The color of each cube keeps changing between black and white. It aims to give a user the sensation of the basic concept of 3D.UO.PAD.
[Figure2.] Interfaces (Paint Bucket & Brush Size)
Through the paint bucket interface, a user selects the brush color. By clicking it, he goes to color space. (See more details in the next section) The second interface is for changing the size of the brush by rotating the dial. (Figure2.)
[Figure3.] Three Categories of Menu & Sub Menus
A user can call menu system in the main stage. (Figure3.) Since we have many functions of virtual pad, interactive menu system is required to control it. There are three categories of main menu, which are canvas, brush, and deform. A user switches each category by turning small triangular cylinder of category. Then, pull down its submenus.
Canvas menu includes the functions that change canvas itself: save and load file, apply texture, toggle texture map, and clear the pad. Brush menu changes the status of brush to painting mode, carving mode, and both of them. Deform menu triggers the function of various deformation. By selecting the deform menu, a user can morph the pad based on the color of painting, pixel value of texture image, inverse the current depth of pad, and fractal algorithm.
[Figure4.] Color Space
This space is designed for the color selection. As we are exploring the space, the basic concept of the color is to connect the meaning of color to space. Just grab the bucket and jump into the world of fully immersive color space. A user feels the sensation of the plenty of various color spots that have their own color based on its location. All color spots are spread all around us. Simply move and see the color in the space as well as in the paint bucket. Wherever you fly, color changes interactively and intuitively.
[Figure5.] Texture Room
Another possibility of 3.D.UO.PAD is texture mapping. Not only drawing directly onto the pad but also selecting the digital image. All color values of the pixels of an image can be interpreted to the shape later. We instinctively capture the sense of the depth from 2 dimensional images. The brightness of the pixel is generated by light in real. 3.D.UO.PAD reverses this fundamental concept to extract the meaning of the color. Texture room has 32 pre-designed images on picture frames. A user selects one of these frames to assign that image on the virtual pad.
[Figure 6.] Archive Room
Basic function of archive room is to make it possible to save and load our creative work in real-time. There are 24 available frames to capture the pad. Once we save it in one of these slots, later we can load our previous work immediately.
- Examples of Works
[Figure7.] Brush Painting Example
Figure7. shows the simple drawing of paint brush. This is the easiest way to use 3.D.UO.PAD.
[Figure8.] Texturing Examples
To help a user understand more complicate result, he could apply texture images onto the sketchpad. (Figure8.)
[Figure9.] Deforming from Painting
Above screenshot (Figure9.) is showing how the user’s drawing (Figure7.) is translated into 3D shape. Sketching pad is morphed along with the painting color.
[Figure10.] Texture Deforming Example 1
[Figure11.] Texture Deforming Example 2
Figure10 and 11 demonstrate how texture images make transformation to the 3D shapes.
[Figure12.] Texture Deforming Example 3 & Fractal Deforming Example 1
The left image of Figure12 has color palette texture image. Each color square makes stick shape, like a collection of various crayon sticks. More randomized deformation example is shown in the right image of Figure12 (fractal deformation with painting).
[Figure13.] Fractal Deforming Example 2
We also can use fractal deformation and texture together. (Figure13.)
3.D.UO.PAD is CAVE based art piece. It can be shown in the 6-wall CAVE or C-WALL (Configurable Wall) system that is utilized by Ygdrasil & CAVE library.
Primary software list shown below:
- CAVERNsoft G2 or QUANTA 4.0 network library
- VRCO CAVE library and trackd software
- SGI Open Performer 2.5 or higher
- Ygdrasil 0.1.11 or 0.4
I’d like to appreciate my academic adviser and friends to help me to develop this idea.
Conceptual Advise: Franz Fischnaller, professor, Electronic Visualization Lab. (EVL), University of Illinois at Chicago, IL, USA
Sound Design: Jung-min Lee, PhD student, Illinois Institute of Technology, IL, USA
Face Illustration: Hyeyun Park, MFA student, Electronic Visualization Lab. (EVL), University of Illinois at Chicago, IL, USA
The Indiana IDEAS (Interactive Digital Environments Arts and Storytelling) Festival is a competition and juried show of interactive entertainment, 3D, 2D, aural, virtual, animated and still creative work which will be held April 23 2005 at the Lee Norvelle Theatre and Drama Center and the Wells-Metz Theatre, Indiana University, Bloomington, Indiana. In this year, total 40 works were selected to exhibit in festival and 10 works were selected as the best work in its category.
3.D.UO.PAD was selected as the best work in Virtual Reality Environment
Basic installaion used two main component. The one is two computers running main graphics and trackign system. The other is John-e-Box that was develped by the Advanced Visualization Laboratory (AVL), Indiana University Bloomington. Abve images shows the snapshots of installation. In typical installation, I use Spacepad tracking antena above the screen but in the exhibition, John-e-Box has relatively small screen and makes us difficulty to hang the antena. The alternative way I used is to lay down antena on the floor and step on it. This requires re-configuration of tracking system. Finally it works fine in the event.
During the showtime, many of people enjoyed 3.D.UO.PAD, so far. First of all, audience was fascinated by stereoscopic vision and started to make their own work (drawings). One difficulty part of exhibition was the variety of audiences. Since virtual reality system tends to configure their installation based on the measure of adult. That means young kids have difficutly to see the screen and interact with 3D virtual object. The other was originally this application was developed using 10x8 feet screen system but Jphn-e-Box has pretty much smaller screen and this caused improper sense of scale.
Here are several selection of audience's work at that day. Most people liked to use dual functional brush (paint and carve mode) to draw something onto canvas. At ths same time, they are not likely to utilize texture image on it. All the user's work were saved through the archiving room and I can reload them later.
Although this was one day event, I had learnt many other aspects of exhibition of virtual reality applicaton such as physical limitation of installation and complexity of the application that could make audience difficult to experience the piece without expert or navigator on site. The most valuable experience was that I really enjoyed it with people and could share my idea with others. This always makes me more creative and motivated.
Thank everyone who participated in 3.D.UO.PAD and Indiana University Bloomington who held this event.