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I would like to be be able to specify a fixed height, but a range for the width in the "Size of particle" diagram. I would then like to be just able to adjust the width over the lifetime of the particle using the "Size over life" diagram.

For example, I want the size of particle to be 200 units high, and 50-100 units wide. Over it's lifetime, I want it to stay at 200 units high, and the width to increase overtime by 300%.

Have I missed something obvious or is there no direct way to do this?

thanks for your help
Andy McDonald

For example, I want the size of particle to be 200 units high, and 50-100 units wide. Over it's lifetime, I want it to stay at 200 units high, and the width to increase overtime by 300%.

Yes, you may change width and height of the particle independently. Use the diagram "Size over life (factor),%". Click on blue square and green line will be added to the diagram.

Best regards,
Alexey Sedov