A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Questions pertaining to creating, generating or editing an objects geometry. Object geometry is defined by editing and creating the location and rotation of vertices, edges, and faces.
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a group of vertices from a mesh that allow specialized selections and or editing.
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Questions about accessing object properties or attributes while scripting
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an efficient technique for simulating bumps and wrinkles on the surface of an object by perturbing the surface Normals to redirect light that hits the surface of the object.
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Questions related to creating and manipulating Blender Text objects. Text objects are useful for quickly creating 3D text by typing on the keyboard.
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many kinds of data that can be linked, (e.g, Materials, Object Data, Modifiers, etc.) even across multiple blendfiles.
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the process of making a three-dimensional solid object of virtually any shape from a digital model.
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a particular way that information is encoded for storage in a computer file.
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used to separate pieces of a scene for rendering. Those layers can then be treated differently in the compositor.
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The Grease Pencil tools allow Blender users to draw lines inside of the 3D viewport. Possible uses for the resulting sketches include scene and animation planning as well as in-scene descriptions. The…
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ways to split a Blender file into sections for organization(kind of like the tabs in a web browser). The game engine uses individual scenes as levels.
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Questions pertaining to using Blender from the command line or using Blender's console window.
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Questions about rendering with volumes (smoke, fog, etc.). Use this tag for both Blender Internal and Cycles.
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for question regarding "data paths" and "file paths" in blender.
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Questions pertaining to software performance or computational speed of Blender should use this tag. (Do not ask hardware specific questions. They are considered off-topic)
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for questions related to precisely positioning objects with the snapping tools.
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Questions pertaining to the Windows Operating System as it relates to Blender. Questions can be anything from compatibility to optimization.
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Blender's new mesh system that was added in 2.63, with full support for N-sided polygons instead of only triangles and quads.
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a bundled addon that provides a ready made character rig with custom controls. It is designed to help build full character rigs with a building block approach.
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a processing unit that is invoked/executed on scene data by the window manager.
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used for many different things, such as compositing, hiding geometry, etc.
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Questions regarding installation of Blender should use this tag. Also, use the respective operating system tag: windows, mac, or linux.
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questions about blender's bevel modifier, text beveling, or the bevel tool in edit mode.
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Blender represents locations in a scene by their coordinates. The coordinates of a location consist of three numbers that define its distance and direction from a fixed origin.
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Use of maths inside blender.
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3D files that can store meshes, animations, blend shapes, and textures.
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Questions about OpenGL (Open Graphics Library) OpenGL is an API used to render real-time 2D and 3D graphics. Blender uses OpenGL for drawing the user interface, 3D view, and the game engine.
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a collection of objects which can be affected as one. Also used for organization.
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An edge and line-based non-photorealistic (NPR) rendering engine. Available in Blender since version 2.67.