Blog Image

Creo Tutorials

About the blog:

New Creo Parametric tutorials to showcase the new features, functions, configuration, renderings and animation with best practice, tips and tricks. You can find more on

How to set the default workspace cache location in Windchill

E-learning Posted on Thu, January 26, 2017 10:42AM

Applies To:

* Windchill PDMLink 9.0 to 11.0
* Windchill ProjectLink 9.0 to 11.0
* Windchill PDM Essentials 10.1 to 11.0
* Pro/INTRALINK 8.x + 9.0 to 11.0
* PTC Windchill Workgroup Manager


Set the following system or user environment variables:

PTC_WF_ROOT=<location that defines the cache directory>

PTC_WLD_ROOT=<location that defines the Workspace Local Directory>
Note: Applicable to those applications that do not support VFS or WFS

PTC_WGM_ROOT=<location that defines the application registry directory>

PTC_VFS_ROOT=<location that defines the PTC Virtual File System cache directory>

Note: Applicable to 10.1 and earlier

PTC_WFS_ROOT=<location of Windchill File System cache directory>
Note: Applicable to 10.2 and later

PTC_WF_CACHE=<location of additional cache directory space>

For Example:

Add the following environment in Control Panel > System > Advanced > Environment Variables, logoff and login:


Model accuracy

E-learning Posted on Sun, December 04, 2016 01:29PM

Pro/ENGINEER and Creo Parametric model accuracy manage arithmetic accuracy of geometric calculations. Can be defined as absolute or relative accuracy.

Relative accuracy:

Relative accuracy is the default model accuracy and indicates the relative model size to the overall size of the part. If you do not use the default value, you should set accuracy to a value less than the ratio of the length of the smallest edge components to the longest diagonal length of the box (i.e. the smallest box into which fits the model). The default value of relative accuracy is 0.0012 – it is most appropriate to use this value whenever possible. The allowable range of accuracy is from 0.01 to 0.0001.

Note: The configuration option accuracy_lower_bound can be used to reduce the permissible range for relative accuracy. This option can be set to a value of 0.000001 and 0.0001.

With decreasing values of relative accuracy Pro/E and Creo is able to recalculate the smallest details – it is possible to identify small entities and smaller gaps. With decreasing values it prolongs regeneration values, increases file size and will take up more space in the memory.

Increase the value of relative accuracy when you import a geometry. Gaps were present at the initial accuracy, with higher accuracy value are not visible. However, using this method to repair imported geometry is not recommended. If you use model with a high relative accuracy in downstream applications such as Pro/MOLD or NC may evoke other problems.

Relative accuracy can be calculated by the following equation:

s > (A * d) / F


s = smallest model edge

A = recommended relative accuracy

d = diagonal length of the box

F = factor based on the part geometry.

Note: This factor takes the complexity of the model geometry (compensates the difference between the complex and easy shape of the geometry). The value is less or equal 10. For simple models can be used 10 but the most commonly used value is 3 or less.

In the example shown in the figure is the diagonal length of the box equal 184.0483. The default accuracy is 0.0012. The factor F should equal 3. Recognizable shortest distance calculated as follows:

s > (A * d) / F

s > (0.0012 * 184.0483)/3

s > 0.006

A < F * (s/d)

It means, if you use the default accuracy (0.0012), the shortest recognizable distance is 0.074.

How to calculate shortest edge and diagonal size?

To calculate the shortest edge, click in the ProE: Analysis > Model > Short Edge or in the Creo: Analysis > Short Edge.

The result will be recorded in the Results section in the table of dialogue.

To calculate the diagonal size, click in the ProE: Info> Model Size or in the Creo: Tools> Model Size.

The value is written to the communication window.

Absolute accuracy:

Absolute accuracy for the component you can define with the configuration option enable_absolute_accuracy to yes. Determination of absolute accuracy for components determine what minimum distance the system Pro/ENGINEER and Creo Parametric is able to recognize.