[Tex/LaTex] Beamer – equation overlay breaking page layout

beamerequationsoverlays

I'm trying to include some overlays on a beamer slide with equations, but the result is different from the original without them.

Here's a minimal example:

\documentclass[spanish,10pt]{beamer}

\usepackage{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{times}

\useoutertheme[height=0pt,width=3cm,left]{sidebar}
\usecolortheme{dove,sidebartab}
\usefonttheme[only large]{structurebold}

\begin{document}

\begin{frame}{Áreas de intercambio directo}
\begin{centering}%
  \framebox(100,60){}% Imagine there's an image instead
\par\end{centering}%

\begin{equation*}
\overline{s_{i}s_{j}}=\iint_{A_{j}}\iint_{A_{i}}\frac{\cos\theta{}_{i}\cos\theta{}_{j}}{\pi r^{2}}\text{e}^{-Kr}\text{d}A_{i}\text{d}A_{j}
\end{equation*}

\onslide<2->
{
\begin{equation*}
\overline{s_{i}g_{j}}=\iiint_{V_{j}}\iint_{A_{i}}\frac{\cos\theta{}_{i}K}{\pi r^{2}}\text{e}^{-Kr}\text{d}A_{i}\text{d}V_{j}
\end{equation*}
}

\onslide<3->
{
\begin{equation*}
\overline{g_{i}g_{j}}=\iiint_{V_{j}}\iiint_{V_{i}}\frac{K^{2}}{\pi r^{2}}\text{e}^{-Kr}\text{d}V_{i}\text{d}V_{j}
\end{equation*}
}

\end{frame}

\end{document}

I get the following result, with that horrible extra vertical space:

enter image description here

If I remove the overlays it looks fine.

I've also tried with \uncover. Same result.

Best Answer

Remove the empty line between the 2nd and the 3rd \onslide<> content.

In addition, I added a \begin{align*}...\end{align*} version for better alignment of equations with respect to the = symbol. 

\documentclass[spanish,10pt]{beamer}

\usepackage{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{times}

\useoutertheme[height=0pt,width=3cm,left]{sidebar}
\usecolortheme{dove,sidebartab}
\usefonttheme[only large]{structurebold}

\begin{document}

\begin{frame}{Áreas de intercambio directo}

\begin{centering}%
  \framebox(100,60){}% Imagine there's an image instead
\par\end{centering}%


\begin{equation*}
\overline{s_{i}s_{j}}=\iint_{A_{j}}\iint_{A_{i}}\frac{\cos\theta{}_{i}\cos\theta{}_{j}}{\pi r^{2}}\text{e}^{-Kr}\text{d}A_{i}\text{d}A_{j}
\end{equation*}

\onslide<2->
{%
\begin{equation*}
\overline{s_{i}g_{j}}=\iiint_{V_{j}}\iint_{A_{i}}\frac{\cos\theta{}_{i}K}{\pi r^{2}}\text{e}^{-Kr}\text{d}A_{i}\text{d}V_{j}
\end{equation*}
}% Remove the empty line here
\onslide<3->
{%
\begin{equation*}
\overline{g_{i}g_{j}}=\iiint_{V_{j}}\iiint_{V_{i}}\frac{K^{2}}{\pi r^{2}}\text{e}^{-Kr}\text{d}V_{i}\text{d}V_{j}
\end{equation*}
}
\end{frame}


\begin{frame}{Áreas de intercambio directo}
\begin{centering}%
  \framebox(100,60){}% Imagine there's an image instead
\par\end{centering}%

\begin{align*}
\overline{s_{i}s_{j}}&=\iint_{A_{j}}\iint_{A_{i}}\frac{\cos\theta{}_{i}\cos\theta{}_{j}}{\pi r^{2}}\text{e}^{-Kr}\text{d}A_{i}\text{d}A_{j} \\
\onslide<2->{%
\overline{s_{i}g_{j}}&=\iiint_{V_{j}}\iint_{A_{i}}\frac{\cos\theta{}_{i}K}{\pi r^{2}}\text{e}^{-Kr}\text{d}A_{i}\text{d}V_{j} \\
}
\onslide<3->{%
\overline{g_{i}g_{j}}&=\iiint_{V_{j}}\iiint_{V_{i}}\frac{K^{2}}{\pi r^{2}}\text{e}^{-Kr}\text{d}V_{i}\text{d}V_{j}} \\
\end{align*}
\end{frame}


\end{document}

enter image description here

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