About Part Accuracy

The accuracy settings for parts control the accuracy of geometry calculations. The valid range of part accuracy is 0.01 to 0.0001, and the default value is 0.0012. The smaller the value of part accuracy, the longer the regeneration time.

The configuration option accuracy_lower_bound overrides the default lower limit.

• Relative (default)—The value should be set as less than half the ratio of the length of the smallest edge on the model to the length of the longest diagonal of the bounding box of the model. Use relative accuracy when you do not need to copy or import geometry from other parts or models.

• Absolute—The value should be set as the smallest recognized size, measured in the current units. Use absolute accuracy when importing a part created using a different system or when copying geometry from one model to another. You must set a uniform absolute accuracy or select the smallest absolute accuracy value as the common accuracy value to make the parts compatible.

When matching absolute accuracy of two models defined with relative accuracy, determine the part sizes using Tools > Investigate >

Model Size and multiply each by its respective relative accuracy. If the results differ, select a relative accuracy value that yields the same result for both parts. You may need to increase the part precision of the larger part by using a smaller relative accuracy value. For example, if the size of one part is 100 and its accuracy is .01, the product of these numbers is 1. If the size of the other part is 1000 and the accuracy is .01, the product of these numbers is 10. Change the accuracy of the second part to .001 to yield the same result.