Use volume maps in DASAPT

DASAPT can render a volume map through the reconstructed needle: concentration (at.%), ion density, peak ratio, or multiplicity density on a voxel grid with Gaussian delocalization. Several saved maps can stay in the project and be shown together.

Volume map

1. Load a reconstruction (.pos, .epos, or .apt) and an .rrng when you need element or peak ranges.
2. On the toolbar, open Volume map and tick the checkbox beside it when you want the overlay in the 3D view.
3. Pick Quantity (concentration, density, peak ratio, or multiplicity density), the ion or peaks, Voxel (nm), Display grid, and Delocalization (nm), then click Compute grid.
4. Choose Display (volume or slice), colormap, opacity, and Min/Max. Highlight high values and Clip outside reconstruction are optional.
5. Use New / the saved list to keep more than one map; check a row to show that map.
6. Rotate animation on the 3D view can export a GIF or MP4 of the current scene.

Concentration maps cache all ranged elements after one compute; switching the ion recomposes the grid without rebuilding every species.

DASAPT 可以在重构针尖上显示体素图：浓度（at.%）、离子密度、峰比值或多重度密度，网格上带高斯离域。项目里可以保存多张体素图，并同时显示。

体素图

1. 载入重构数据（.pos、.epos 或 .apt）；需要元素或峰范围时载入 .rrng。
2. 点工具栏 Volume map；要在三维里叠加体素图时，勾选按钮旁的小框。
3. 选择 Quantity（浓度、密度、峰比或多重度密度）、离子或峰、Voxel (nm)、Display grid 和 Delocalization (nm)，再点 Compute grid。
4. 设置 Display（体渲染或切片）、色标、透明度和 Min/Max。可按需勾选 Highlight high values 和 Clip outside reconstruction。
5. 用 New 和保存列表保留多张图；勾选某一行即可显示该图。
6. 三维视图上的 Rotate animation 可以把当前画面导出为 GIF 或 MP4。

浓度图在计算一次后会缓存各元素；切换离子时只重组当前物种，不必重算全部元素。