![]() (The fabric and sewing metaphor is significant when talking about NURBS surfaces.) If the surface forms a topologically closed volume, it’s called a solid. If the patches are stitched together within a close enough tolerance (which varies depending on the CAD system), the surface is said to be watertight. The trick to making it work is to add a trimming curve to each patch, to define its borders, so it can be any shape it needs to be.ĬAD surface models are made up of multiple trimmed NURBS patches, stitched together to form a whole. As you might imagine, building a CAD model out of a bunch of 4-sided surfaces (patches, in this context) is difficult to impossible. The biggest thing that makes NURBS not a perfect choice is that they only come in one form: 4-sided. NURBS can be used to accurately represent both analytic surfaces (e.g., spheres, cones, cylinders and tori), and free-form surfaces, so they’re a good, but not perfect, choice as a native geometric form for CAD. Most modern CAD systems represent surfaces using a standard mathematical form: NURBS (Non Uniform Rational B-Splines), invented in 1975 by Ken Versprille. To understand the challenge, it helps to look under the covers, at how CAD systems represent shapes. Yet, organic shapes, which often have free-form sculpted surfaces or complex surface detail, have always been tough to do. Over time, they’ve even gotten pretty good at dealing with smooth aesthetic surfaces, such as car bodies. Historically, CAD systems have been very good at representing geometrically well-defined shapes. A visual stimulus of delightful shapes properly composed will evoke an equal emotional response of joy and gladness.The Geomagic/Sensable Phantom Omni haptic input device provides force-feedback input, to allow clay-like modeling of surfaces. Feelings are triggered by what we see and sense. A photographer once said that the eye traffics in feelings, not in thoughts. Going for the soft curves of organic shapes or the hard corners of geometric shapes, and partnering them with the right colors, lines, patterns and light will create captivating images. Shapes are compositional and design elements that are visually appealing. ![]() With the technological revolution, man can now create structures and buildings mimicking organic shapes. ![]() Although they may also appear in nature, geometric shapes are products of man – rectangles, squares, triangles – which are building blocks of design and construction. ![]() Which is the exact opposite of geometric shapes. Being free form, they don’t have uniformity and perfect measurements. ![]() Organic shapes are out there in the natural world, created by the environment. They look natural and are mostly found in leaves, flowers, plants and animals. Their main characteristics are curving appearance and smooth flowing outline. Organic shapes are also called curvilinear that are made up of curves, angles or both. The difference between organic and geometric shapes ![]()
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