> ## Documentation Index > Fetch the complete documentation index at: https://docs.realtimelca.com/llms.txt > Use this file to discover all available pages before exploring further. # 3D model viewer > See the model, inspect an element, and colour it by emission intensity. The viewer shows the geometry that has been published into the project's models. It is the quickest way to find out what an element actually is, whether it is mapped, and which parts of the building carry the most carbon. Open it from **3D model** in the project rail, or from the link in the dashboard's summary strip. Model viewer with callouts for the view controls, element selection, the viewer tools, the mapping status, and the change EPD action. Model viewer with callouts for the view controls, element selection, the viewer tools, the mapping status, and the change EPD action. ## Inspect an element Click any element to open **Inspect element**. It reports the type, family, and category that came from the authoring tool, and whether the element is **Mapped** or **Unmapped**. * **Zoom** frames the selection; **Isolate** hides everything else; **Deselect** clears it. * Under **Materials**, every material on the element is listed with the EPD it is mapped to. **Change EPD** re-maps it without leaving the viewer. * **Open in full mapping** jumps to the row in [Material Mapping](/user-guide/project/material-mapping). ## Colour the model by impact The viewer can shade the model by emission intensity instead of by material, which makes the hot spots obvious at a glance. Model shaded from pale to deep red by emission intensity, with a colour scale and a list of the highest-intensity types. The legend doubles as a filter: pick a type to highlight it in the model, drag the range handles to narrow the band being coloured, and **Reset range** puts it back. ## Find what is not mapped The mapping filter turns the model into a checklist — how many elements are mapped, how many are incomplete, and how many are untouched. Material mapping filter panel showing 187 of 187 elements mapped, with All, Unmapped, Incomplete, and Mapped tabs and a next unmapped control. Switch between **All**, **Unmapped**, **Incomplete**, and **Mapped**, then step through the model with **Next unmapped** until nothing is left. Unmapped geometry contributes nothing to the result, so a model that looks complete can still be hiding a gap. This filter and the **% MAPPED** bar are the two places that gap shows up.