I make a lot of models that involve pyramidal frustrums (transition of a rectangular section to another rectangular section, linearly). Rather than use the measured value calculated by Creo, I thought I'd have a go at calculating the volume directly from the dimensions.
When I check my calculations, the volume calculated directly from the dimensions differs from the Creo analysis result.
I minimized the accuracy value, but still get the exact same result.
Here are my simple values
Base rectangle: 5 X 3 -> Base area: 15
Top rectangle: 4 X 2 -> Top area: 8
Height: 1
Frustrum of a pyramid volume is
Volume = ( Area Base + Area Top + SQRT ( Area Base * Area Top ) ) * Height / 3 = 11.3182
Creo, on the other hand, gives a volume of 11.3333.
Anyone have any insights into this?
This is simple shape, and kind of scares me about what might be happening with more complicated geometry.