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Modification de formes à l'aide de systèmes immersifs de type CAVE

Abstract : The design creation of an object can be seen as the exploration of a Designer's "Mental Shape Space", supported by Design Review sessions. In the automotive industry, these sessions are organized around sketches, physical or digital mock-ups, and nowadays frequently in Virtual Reality. This technology has the advantage to show the product at real scale, while being more time and cost-effective compared to physical mock-ups.However, it is currently not possible to modify the shape directly in the Virtual Reality environment. This limitation restricts the interaction to verbal feedbacks.We propose an immersive modification tool that does not require any modelling expertise, as Design Reviews gather people from different backgrounds. We focus on two types of modifications: global, on the whole surface, and more local, on feature lines.To stay in the Designer's Mental Shape Space, we aim at preserving the initial style of the object. Our method is based on ARAP (As-Rigid-As-Possible) methods, known to preserve the initial shape, while offering an intuitive direct manipulation. However, these methods are too organic for man-made shapes. Through a mechanical analysis, we show that ARAP-based methods rely on a membrane behavior, causing artifacts on automotive shapes.To control the modification of these shapes, while providing a predictable behavior for the deformation, we go on with the mechanical analysis. This let us state that a more appropriate stiffness distribution improves the control of shape deformation. Thus, we modify ARAP weights and relate it to the material properties. We show that this modification can be seen as turning the material into an anisotropic linear material, and more specifically, an orthotropic material whose principal directions are defined to preserve the initial style of the object. This method proves to be also effective on feature line deformations, and we adapt it to in-plane modifications. Examples on meshes from the automotive industry illustrate our contributions.
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https://tel.archives-ouvertes.fr/tel-03323777
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Submitted on : Monday, August 23, 2021 - 1:01:13 AM
Last modification on : Friday, March 25, 2022 - 9:43:40 AM
Long-term archiving on: : Wednesday, November 24, 2021 - 6:05:24 PM

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  • HAL Id : tel-03323777, version 1

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youna Le Vaou. Modification de formes à l'aide de systèmes immersifs de type CAVE. Modélisation et simulation. Université Grenoble Alpes [2020-..], 2020. Français. ⟨NNT : 2020GRALM011⟩. ⟨tel-03323777⟩

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