geometry

Italian news site AltreNotizie reports on an embargo linked to Canada and Israel, described as applying unevenly depending on circumstances, a 'variable geometry' arrangement. The piece connects the story to broader debates around the Gaza conflict and its economic and political fallout, which readers are following alongside related coverage of Ukraine and ongoing trade and arms restrictions.

An Italian-language commentary examines Canada's stance on the arms embargo against Israel, describing it as 'a variable geometry' policy — inconsistent or selectively applied. The piece links the issue to democracy, government, technology and markets, suggesting Canada's official position does not match its practice. Little verified detail beyond the headline claim is available.

A new technical write-up explains how the dual polytope can be used to simplify convex hulls, walking through the underlying geometry and its practical applications in computational geometry and graphics. Readers with an interest in mathematics and programming are discussing the approach and its usefulness for reducing mesh complexity.

Edmund Halley House in Oxford, UK is being highlighted as a historic site tied to the astronomer's life. Edmond Halley was appointed Savilian Professor of Geometry in January 1703/4 and is believed to have moved into the house two months later as a sub-tenant under a lease John Wallis had held from New College. An observatory was built there in 1705.

Developer Matt Keeter has released Halfspace, an experimental integrated development environment for solid modeling built on distance fields. The tool lets users define 3D geometry programmatically, offering an alternative to traditional CAD approaches. It is drawing attention among programmers and CAD enthusiasts interested in new ways to represent and edit solid models.

The great dirhombicosidodecahedron, nicknamed 'Miller's Monster', is drawing attention among geometry and polyhedron enthusiasts. It is one of the nonconvex uniform polyhedra catalogued by Miller and is considered among the most complex of them, notable for its intricate arrangement of intersecting faces. Model builders are sharing images and discussions of constructing it in paper and other materials.

IMAX Dome theaters screen films on a curved, wraparound dome that surrounds the audience, unlike standard IMAX's flat giant screen. Engadget explains how the domed format changes viewing geometry, projection and the overall experience compared with regular IMAX auditoriums, highlighting why some films play better in one format than the other.

A 1995 article on wavelets in 3D graphics has resurfaced, drawing attention on a developer forum. The piece explores how wavelet transforms can compress and represent three-dimensional data such as surfaces and lighting, a technique relevant to rendering and geometry processing. Readers are revisiting the mathematical foundations and discussing how the ideas hold up in modern graphics pipelines.

Ars Technica reports that butterfly wings and the classic rotating barbershop pole rely on the same visual phenomenon: motion illusions created by how light and structure interact. In both cases, patterns moving in one direction can appear to shift the opposite way, a property tied to the microscopic structure of wing scales and the geometry of the striped pole, with implications for studying optics and perception in biology.

A developer writing under the name Eniko has published a detailed blog post explaining how software-rendered occlusion culling works in their block-based game. The post walks through the rendering technique used to avoid drawing hidden geometry. It has drawn attention among game developers and is being discussed on Hacker News, where readers are weighing in on the approach and its practical uses.