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8/9/2019 Blender |Blender Reference Manual.pdf
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Blender Reference Manual
Getting Started
Editors
Data System Modeling Physics Modifiers Rigging Animation Rendering Compositing Motion Tracking Grease Pencil Game Engine Extending Blender User Preferences Troubleshooting
Glossary
About this Manual
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Glossary
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Glossary
Active
Blender makes a distinction between selected and active. Only one Object or itemcan be active at any given time.
Actuator
A logic brick that acts like a muscle of a lifeform. It can move the object, or also
make a sound.
Aliasing
Rendering artifacts in the form of jagged lines.
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Alpha Channel
Additional channel in 2D image for transparency.
Ambient Light
It’s light that doesn’t seem to come from a specific source, but is just there. In the
real world, this is caused by stray photons bouncing around and occasionally
ricocheting under the desk. Since the light doesn’t come from anywhere, all sides ofan object are illuminated equally, and it won’t have any shading on it.
Ambient Occlusion
A ratio of how much ambient light a surface point would be likely to receive. It
simulates a huge dome light surrounding the entire scene. If a a surface point isunder a foot or table, it will end up much darker than the top of someone’s head or
the tabletop.
Animation
Simulation of motion.
Anti-aliasingSee oversampling .
Armature
A single-member class of primitive object. It consists of bones. Its primary use is in
development of animated, articulated objects.
Automerge
Editing mode working with Snap-tool. It removes the doubles when you snap 2
vertices.
Axis
A reference line depicting the direction of one of the coordinates in any coordinatesystem.
Bevel
Operation to chamfer or bevel edges of an object.
Bone
Each of the segments that make up an armature.
Boolean
Operation that takes 2 meshes. There 3 types: union, intersection and difference.
Order of meshes is important for difference operation. With A and B as the meshes:
Difference (A - B): the inner part of B is substracted from the inner part of A.
Union: the inner parts of both meshes A and B are combined.
Intersect: only inner parts both meshes have in common are kept.
These operations take care of inner and outer parts of meshes (given by normals).
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Bounding Box
Box that encloses the shape of an object. The box is aligned with the local space of
the object.
Bump Mapping
Is a technique where at each pixel, a perturbation to the surface normal of the object
being rendered is looked up in a texture map and applied before the illuminationcalculation is done.
Bézier
It’s a computer graphics technique for generating and representing curves.
Caustics
In optics is a bundle of light rays. For example a caustic effect may be seen when
light refracts or reflects through some refractive or reflective material, to create amore focused, stronger light on the final location. Such amplification, especially of
sunlight, can burn – hence the name. A common situation when caustics are visible
is when some light points on glass. There is a shadow behind the glass, but alsothere is a stronger light spot. Nowadays, almost every advanced rendering system
supports caustics. Some of them even support volumetric caustics. This is
accomplished by raytracing the possible paths of the light beam through the glass,accounting for the refraction, reflection, etc.
Collapse
Is a tool used to remove redundant edges from geometry.
Color Blend Modes
Ways in which 2 colors can be blended in computer graphics.
See Wikipedia’s Blend Modes article for more information.
Concave face
Face in which one vert is inside a triangle formed by other vertices of the face.
Constraint
Tt is any factor that limits the performance of a system with respect to its goal.
Control
cage
Mesh used in subsurf modeling to control the shape of the mesh.
Controlle
r
A logic brick that acts like the brain of a lifeform. It makes decisions to activate
muscles (actuators), either using simple logic or complex Python scripts.
C
o
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n
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Not concave face. Opposite of concave face.
C
o
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rItems that are in the same plane in 3D space.
C
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It’s used to define the sharpness of edges and faces of subsurfaced meshes.
C
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It’s a class of objects. In Blender there are Bézier curves and NURBS curves.
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It’s the distance in front of and behind the subject which appears to be in focus. Forany given lens setting, there is only one distance at which a subject is precisely in
focus, but focus falls off gradually on either side of that distance, so there is a region
in which the blurring is tolerable. This region is greater behind the point of focusthan it is in front, as the angle of the light rays change more rapidly; they approach
being parallel with increasing distance.
It’s even, directed light coming off a surface. For most things, the diffuse light is themain lighting we see. Diffuse light comes from a specific direction or location, and
creates shading. Surfaces facing towards the light source will be brighter, while
surfaces facing away from the light source will be darker.
Is a light that has a specific direction, but no location. It seems to come from aninfinitely far away source, like the sun. Surfaces facing the light are illuminated
more than surfaces facing away, but their location doesn’t matter. A Directional
Light illuminates all objects in the scene, no matter where they are.
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Uses a greyscale heightmap, like Bump Mapping , but the image is used to
physically move the vertices of the mesh at render time. This is of course onlyuseful if the mesh has large amounts of vertices.
The Doppler effect is the change in pitch that occurs when a sound has a velocity
relative to the listener. When a sound moves towards the listener the pitch will rise.When going away from the listener the pitch will drop. A well known example is
the sound of an car passing by.
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Blender uses two buffers (images) to draw the interface in. The content of one buffer is displayed, while drawing occurs on the other buffer. When drawing is
complete, the buffers are switched.
Straight segment (line) that connects 2 vertices, and can be part of a face.
Chain of edges belonging to consecutive quads. An edge loop ends at a pole or a
boundary. Otherwise it is cyclic.
Path of all edges along a face loop that share 2 faces belonging to that loop.
Kind of object that cannot hold any geometry.
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Method of calculating reflections. It involves rendering images at strategic positionsand applying them as textures to the mirror. Now in most cases obsoleted by
Raytracing, which though slower is easier to use and more accurate.
It’s a tool used to create more geometry into the mesh. It is a very commonly used
tool.
Mesh element that defines a piece of surface. It consists of 3 or more edges.
Chain of consecutive quads. A face loop stops at a triangle or Ngon (which don’t belong to the loop), or at a boundary. Otherwise it’s cyclic.
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An object’s geometric center coincides with the geometric center of its bounding box.
Is a superset of radiosity and ray tracing. The goal is to compute all possible light
interactions in a given scene, and thus obtain a truly photo realistic image. All
combinations of diffuse and specular reflections and transmissions must beaccounted for. Effects such as colour bleeding and caustics must be included in a
global illumination simulation.
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Used to achieve smooth lighting on low-polygon surfaces without the heavycomputational requirements of calculating lighting for each pixel. The technique
was first presented by Henri Gouraud in 1971.
HDRI is a set of techniques that allow a far greater dynamic range of exposures than
normal digital imaging techniques. The intention is to accurately represent the wide
range of intensity levels found in real scenes, ranging from direct sunlight to the
deepest shadows. The use of high dynamic range imaging in computer graphics has been popularised by the work of Paul Debevec.
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It’s a property of transparent materials. When a light ray travels through the same
volume it follows a straight path. However if it passes from one transparent volumeto another, it bends. The angle by which the ray is bent can be determined by the
IOR of the materials of both volumes.
Method of calculating new data between points of known value, like keyframes.
Curve that holds the animation values of a specific property.
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Is the process of determining the movement of interconnected segments of a body
or model. Using ordinary Kinematics on a hierarchically structured object you canfor example move the shoulder of a puppet. The upper and lower arm and hand will
automatically follow that movement. IK will allow you to move the hand and let thelower and upper arm go along with the movement. Without IK the hand would
come off the model and would move independently in space.
It’s a frame in an animated sequence drawn or otherwise constructed directly by theuser. In classical animation, when all frames were drawn by animators, the senior
artist would draw these frames, leaving the “in between” frames to an apprentice. Now, the animator creates only the first and last frames of a simple sequence
(keyframes); the computer fills in the gap.
Is a tool used to cut meshes to get more geometry.
A visibility flag for objects.
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A graphical representation of a functional unit in Blender’s game logic. A Logic brick can be aSensor , Controller or Actuator .
Manifold meshes, called also water tight meshes, define a closed non-self-
intersecting volume(see also non-manifold ).
Type of object consisting of vertices, edges and faces.
It’s the simulation of the phenomenon that occurs when we perceive a rapidly
moving object. The object appears to be blurred because of our persistence ofvision. Doing motion blur makes computer animation appear more realistic.
It’s a face that contains more than four vertices.
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Animation technique that allows the animator to edit motions as a whole, not just
the individual keys. Nonlinear animation allows you to combine, mix, and blend
different motions to create entirely new animations.
Non-Manifold meshes essentially define geometry which cannot exist in the real
world. This kind of geometry is not suitable for several types of operations,
specially those where knowing the volume (inside/outside) of the object is
important (refraction, fluids, booleans, or 3D printing, to name a few). There are
several types of non-manifold geometry:
Borders and holes (edges with only a single connected face), as faces have no
thickness.
Edges and vertices not belonging to any face (wire).
Edges connected to 3 or more faces (interior faces). Vertices belonging to faces that are not adjoining (e.g. 2 cones sharing the
vertex at the apex).
Use 3D View ‣ Select ‣ Non Manifold to select these types of non-manifold
geometry in a mesh.
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The normalized vector perpendicular to the plane that a face lies in. Each face has
its own normal.
Is a computer graphics technique for generating and
representing curves and surfaces.
Is similar to Bump mapping , but instead of the image being a greyscale heightmap,
the colours define in which direction the normal should be shifted, the 3 colour
channels being mapped to the 3 directions X, Y and Z. This allows more detail andcontrol over the effect.
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Reference point of an object for positioning (translating), orienting (rotating), andscaling an it. In most cases, this center is at the geometric center of the object
(geometric center of its bounding box). However, an object’s center may be offset
from the geometric center.
Is the technique of minimizing aliasing when representing a high-resolution signal
at a lower resolution.
Also called Anti-Aliasing.
It’s a technique that simulate certain kinds of fuzzy phenomena, which are
otherwise very hard to reproduce with conventional rendering techniques. Common
examples include fire, explosions, smoke, sparks, falling leaves, clouds, fog, snow,dust, meteor tails, stars and galaxies, or abstract visual effects like glowing trails,
magic spells. Also used for fur, grass or hair.
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Local illumination model that can produce a certain degree of realism in three-
dimensional objects by combining three elements: diffuse, specular and ambient foreach considered point on a surface. It has several assumptions - all lights are points,
only surface geometry is considered, only local modelling of diffuse and specular,specular colour is the same as light colour, ambient is a global constant.
It’s a reference point used by many mesh manipulation tools.
It’s a vertex in which three or five or more edges are connected to. A vertex
connected to one, two or four edges, is not a pole.
Is a basic object that can be used as a basis for modeling more complicated objects.
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Computer generated (generic) textures. Procedural textures can be configured via parameters.
Used to alter existing model in a more organic way. When elements are moved
interactively, neighbouring elements are also moved depending on their distance
and the defined parameters.
It’s a face that contains exactly four vertices.
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It’s a more accurate but also more process-intensive technique than raytracing, thatcalculates patterns of light and shadow for rendering graphics images from three-
dimensional models. One of the many different tools which can simulate diffuse
lighting in Blender.
Rendering technique that works by tracing the path taken by a ray of light through
the scene, and calculating reflection, refraction, or absorption of the ray whenever it
intersects an object in the world. More accurate than scanline, but much slower.
It’s the change in direction of a wave due to a change in velocity. It happens whenwaves travel from a medium with a given index of refraction to a medium with
another. At the boundary between the media, the wave changes direction; its
wavelength increases or decreases but frequency remains constant.
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Are part of a keyframe animation system that operates on vertex level objects. Each
key is stored as a morph target such that several keys may be blended together toachieve complex mesh animation. Facial expressions, speech, and other detailed
animated keyframed movements can be created within mesh-based models.
Proccess of generating an image out of a 3D model on a computer.
Rendering technique. Much faster than raytracing , but allows fewer effects, such asreflections, refractions, motion blur and focal blur.
A logic brick that acts like a sense of a lifeform. It reacts to touch, vision, collision
etc.
Process of altering the color of an object/surface in the 3D scene, based on its angleto lights and its distance from lights to create a photorealistic effect.
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Defines how faces are shaded. Face can be either solid (faces are rendered flat) or
smooth (faces are smoothed by interpolating the normal on every point of the face).
Refers to the highlights on reflective objects.
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Mechanism of light transport in which light penetrates the surface of a translucentobject, is scattered by interacting with the material, and exits the surface at a
different point. All non-metallic materials are translucent to some degree. In
particular, materials such as marble, skin, and milk are extremely difficult tosimulate realistically without taking subsurface scattering into account.
It’s used to add more geometry to a mesh. It creates new vertices on subdividededges, new edges between subdivisions and new faces based on new edges. If new
edges cross a new vertex is created on their crossing point.
Is the tool which subdivides your model at render-time, without affecting your meshat design-time.
Also called: Subsurf .
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A texture specifies visual patterns on surfaces and simulates physical surfacestructure.
It’s a face with exactly 3 vertices.
A UV map defines a relation between the surface of a 3 dimensional mesh and and a
planar 2D texture. In detail, each face of the mesh is mapped to a corresponding
face on the texture. It is possible and often common practice to map several faces ofthe mesh to the same or overlapping areas of the texture.
It’s a point in 3D space containing a location. It may also have a defined color.
Vertices are the terminating points of edges.
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Term used for uploading geometry to the graphics cards memory for improved
performance.
See Wikipedia’s Vertex Buffer Object article for more information.
Vertices can be grouped together so that certain operations can work on specific
groups.
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