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Deleting and Merging

These tools can be used to remove components.

Delete

Delete (X or Del)
Deletes selected vertices, edges, or faces. This operation can also be limited to:
Vertices
Delete all vertices in current selection, removing any faces or edges they are connected to.
Edges
Deletes any edges in the current selection. Removes any faces that the edge shares with it.
Faces
Removes any faces in current selection.
Only Edges & Faces
Limits the operation to only selected edges and adjacent faces.
Only faces
Removes faces, but edges within face selection are retained.
Edge Collapse
Collapses edges into single vertices. This can be used to remove a loop of faces.
Edge Loop
Deletes an edge loop. If the current selection is not an edge loop, this operation does nothing.

Dissolve

Dissolve operations are also accessed from the delete menu. Instead of removing the geometry, which may leave holes that you have to fill in again, dissolve will remove the geometry and fill in the surrounding geometry.

Dissolve
Removes selected geometry, but keeps surface closed, effectively turning the selection into a single n-gon. Dissolve works slightly different based on if you have edges, faces or vertices selected. You can add detail where you need it, or quickly remove it where you don't.
Limited Dissolve
Limited Dissolve reduces detail on planar faces and linear edges with an adjustable angle threshold.
Example showing the how Limited Dissolve can be used.
Face Split - dissolve option.
When dissolving vertices into surrounding faces, you can often end up with very large, uneven ngons.
The face split option limits dissolve to only use the corners of the faces connected to the vertex.
Dissolve Face Split option. Left - the input, middle - regular dissolve, right - Face Split enabled



Convert Triangles to Quads

Tris to Quads AltJ This takes adjacent tris and removes the shared edge to create a quad. This tool can be performed on a selection of multiple triangles.

This same action can be done on a selection of just 2 tris, by selecting them and using the shortcut F, to create a face.

Unsubdivide

Mode: Edit mode

Hotkey: CtrlE » Unsubdivide

Menu: Mesh » Edges » Unsubdivide

Unsubdivide functions as the reverse of subdivide by attempting to remove edges that were the result of a subdivide operation. If additional editing has been done after the subdivide operation, unexpected results may occur.

Iterations
How many subdivisions to remove.

Merging

Merging Vertices

Mode: Edit mode

Hotkey: AltM

Menu: Mesh » Vertices » Merge..., Specials » Merge or Vertex Specials » Merge

This tool allows you to merge all selected vertices into an unique one, deleting all others. You can choose the location of the surviving vertex in the menu this tool pops up before executing:

At First
Only available in Vertex select mode, it will place the remaining vertex at the location of the first one selected.
At Last
Only available in Vertex select mode, it will place the remaining vertex at the location of the last one selected (the active one).
At Center
Available in all select modes, it will place the remaining vertex at the center of the selection.
At Cursor
Available in all select modes, it will place the remaining vertex at the 3D Cursor.
Collapse
This is a special option, as it might let “live” more than one vertex. In fact, you will have as many remaining vertices as you had “islands” of selection (i.e. groups of linked selected vertices). The remaining vertices will be positioned at the center of their respective “islands”. It is also available via the Mesh » Edges » Collapse menu option…

Merging vertices of course also deletes some edges and faces. But Blender will do everything it can to preserve edges and faces only partly involved in the reunion.

AutoMerge Editing

Mode: Edit mode

Menu: Mesh » AutoMerge Editing

The Mesh menu as a related toggle option: AutoMerge Editing. When enabled, as soon as a vertex moves closer to another one than the Limit setting (Mesh Tools panel, see below), they are automatically merged.

Remove Doubles

Mode: Edit mode

Panel: Editing context → Mesh Tools

Hotkey: W » 4 or CtrlV » Remove doubles

Menu: Mesh » Vertices » Remove Doubles, Specials » Remove Doubles or Vertex Specials » Remove Doubles

Remove Doubles is a useful tool to simplify a mesh by merging vertices that are closer than a specified distance to each other. An alternate way to simplify a mesh is to use the Decimate modifier.

Merge Distance
Sets the distance threshold for merging vertices, in Blender units.
Unselected
Allows vertices in a selection to be merged with unselected vertices. When disabled, selected vertices will only be merged with other selected ones.




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This is the old manual!
For the current 2.7x manual see http://www.blender.org/manual/


User Manual

World and Ambient Effects

World

Introduction
World Background

Ambient Effects

Mist
Stars (2.69)


Game Engine

Introduction

Introduction to the Game Engine
Game Logic Screen Layout

Logic

Logic Properties and States
The Logic Editor

Sensors

Introduction to Sensors
Sensor Editing
Common Options
-Actuator Sensor
-Always Sensor
-Collision Sensor
-Delay Sensor
-Joystick Sensor
-Keyboard Sensor
-Message Sensor
-Mouse Sensor
-Near Sensor
-Property Sensor
-Radar Sensor
-Random Sensor
-Ray Sensor
-Touch Sensor

Controllers

Introduction
Controller Editing
-AND Controller
-OR Controller
-NAND Controller
-NOR Controller
-XOR Controller
-XNOR Controller
-Expression Controller
-Python Controller

Actuators

Introduction
Actuator Editing
Common Options
-2D Filters Actuator
-Action Actuator
-Camera Actuator
-Constraint Actuator
-Edit Object Actuator
-Game Actuator
-Message Actuator
-Motion Actuator
-Parent Actuator
-Property Actuator
-Random Actuator
-Scene Actuator
-Sound Actuator
-State Actuator
-Steering Actuator
-Visibility Actuator

Game Properties

Introduction
Property Editing

Game States

Introduction

Camera

Introduction
Camera Editing
Stereo Camera
Dome Camera

World

Introduction

Physics

Introduction
Material Physics
No Collision Object
Static Object
Dynamic Object
Rigid Body Object
Soft Body Object
Vehicle Controller
Sensor Object
Occluder Object

Path Finding

Navigation Mesh Modifier

Game Performance

Introduction
System
Display
Framerate and Profile
Level of Detail

Python API

Introduction
Bullet physics
VideoTexture

Deploying

Standalone Player
Licensing of Blender Game

Android Support

Android Game development