# Form factor on BornAgain

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# Custom formfactor

file:///usr/share/doc/bornagain/html/ref/sample/particle/ff/custom.html Mon, 01 Jan 0001 00:00:00 +0000 file:///usr/share/doc/bornagain/html/ref/sample/particle/ff/custom.html <h3 id="custom-formfactor">Custom formfactor</h3> <p>Scattering from a monodisperse distribution of particles, whose form factor is defined by the user.</p> <ul> <li>This example shows how users can simulate their own particle shape by implementing the analytical expression of its form factor.</li> <li>The particular shape used here is a polyhedron, whose planar cross section is a &ldquo;plus&rdquo; shape with a side length of $20$ nm and a height of $15$ nm.</li> <li>These particles are distributed on a substrate.</li> <li>There is no interference between the scattered waves.</li> <li>The wavelength is equal to 0.1 nm.</li> <li>The incident angles are $\alpha_i = 0.2 ^{\circ}$ and $\varphi_i = 0^{\circ}$.</li> </ul> <div class="galleryscg "> <div class="row justify-content-center align-items-center"> <figure > <a href="file:///usr/share/doc/bornagain/html/img/draw/CustomFormfactor_setup.jpg"> <img src="file:///usr/share/doc/bornagain/html/img/draw/CustomFormfactor_setup.jpg" width="350px"> </a> <figcaption> <p>Real-space model</p>