Papers by Adrien Bernhardt
Proceedings of the 2008 ACM symposium on Virtual reality software and technology - VRST '08, 2008
This paper presents a novel interaction system, aimed at hands-on manipulation of digital models ... more This paper presents a novel interaction system, aimed at hands-on manipulation of digital models through natural hand gestures. Our system is composed of a new physical interaction device coupled with a simulated compliant virtual hand model. The physical inter- face consists of a SpaceNavigator, augmented with pressure sensors to detect directional forces applied by the user's fingertips. This in- formation controls the position, orientation, and posture of the vir- tual hand in the same way that the SpaceNavigator uses measured forces to animate a virtual frame. In this manner, user control does not involve fatigue due to reaching gestures or holding a desired hand shape. During contact, the user has a realistic visual feedback in the form of plausible interactions between the virtual hand and its environment. Our device is well suited to any situation where hand gesture, contact, or manipulation tasks need to be performed in vir- tual. We demonstrate the device in several simple virtual worlds and evaluate it through a series of user studies.
ACM SIGGRAPH 2011 Posters on - SIGGRAPH '11, 2011
a) (b) (c) Figure 1: Terrain modeling example: as each stroke is drawn (a) or manipulated (c), th... more a) (b) (c) Figure 1: Terrain modeling example: as each stroke is drawn (a) or manipulated (c), the terrain is tessellated in the GPU to follow the stroke.
Computer Graphics Forum, 2010
: Models generated interactively using a new approach to implicit blending. Note the capability o... more : Models generated interactively using a new approach to implicit blending. Note the capability of the shapes to come close to each other without blending. From left to right : The dragon, a dancer loop, the alien, a tree.
… Workshop on Sketch-Based …, 2008
This paper presents Matisse, an interactive modeling system aimed at providing the public with a ... more This paper presents Matisse, an interactive modeling system aimed at providing the public with a very easy way to design free-form 3D shapes. The user progressively creates a model by painting 2D regions of arbitrary topology while freely changing the view-point and zoom factor. Each region is converted into a 3D shape, using a variant of implicit modeling that fits convolution surfaces to regions with no need of any optimization step. We use intuitive, automatic ways of inferring the thickness and position in depth of each implicit primitive, enabling the user to concentrate only on shape design. When he or she paints partly on top of an existing primitive, the shapes are blended in a local region around the intersection, avoiding some of the well known unwanted blending artifacts of implicit surfaces. The locality of the blend depends on the size of smallest feature, enabling the user to enhance large, smooth primitives with smaller details without blurring the latter away. As the results show, our system enables any unprepared user to create 3D geometry in a very intuitive way.
ACM Transactions on Graphics, 2013
We introduce a new family of binary composition operators that solves four major problems of cons... more We introduce a new family of binary composition operators that solves four major problems of constructive implicit modeling: suppressing bulges when two shapes merge, avoiding unwanted blending at a distance, ensuring that the resulting shape keeps the topology of the union, and enabling sharp details to be added without being blown up. The key idea is that field functions should not only be combined based on their values, but also on their gradients. We implement this idea through a family of C ∞ composition operators evaluated on the GPU for efficiency, and illustrate it by applications to constructive modeling and animation.
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Papers by Adrien Bernhardt