Is there a way to set absolute dimensions of an object. Once I've created a cylinder for example, how can I go back and change the length? I know I can scale it, but I want to set an absolute length and cannot find any panels, tools, etc., to show / edit this data.
In Object mode :
- Press N to show the properties panel
- Select your object
- You can set the dimension from the panel
- These are the dimensions of the bounding box and not the height, width and depth of the cube
- You can't set the diameter height as you did when creating the object
Since you mentioned scaling: The above answer allows you to do this; but, in some cases this can cause problems because it applies a transformation to your object, especially if you start working in absolute lengths, like in feet or meters. In order to get scaling back to the original 1.000 scaling and avoid this problem you must apply the transformation to your data.
To do this, while still in Object Mode and the object selected, key [CTRL-A] then select [Scale], this will convert the scale back to 1.000, this in effect removes the scale transformation, and sets the data such that no transformation applies and any scaling will no longer affect your 'absolute' dimensions. It is particularly useful when using absolute units.
If you need absolute values for feet or meters, you can find this setting under Properties/Scene/Units, then select 'Metric' or 'Imperial' and specify the units.
- Separate units: will list the units broken down. Example: Imperial: 3.5'=>3'6"
- Scale: Blender Units (BU) per unit measure. Example Scale Imperial: 1 BU = 1 ft, 0.1 BU = 1 foot, 0.01 BU = 1 ft, etc. (this appears in the grid size)
- Metric and Imperial don't mix: For example: Imperial: 3m = 3 mi; Metric: 3m=3 meters.