Create a room with a curved and sloped floor in EASE

In this tutorial, we will model a horseshoe-shaped venue with a sloped orchestra floor.

Modelling

In this exercise, we will build a horseshoe-shaped venue that includes a sloped orchestra floor. To simplify the modeling process, we will first create only one half of the room geometry. Since the venue is symmetrical, the second half can later be generated automatically by using the Mirror function in EASE.

The coordinate origin (0,0,0) is positioned at the center of the proscenium line. This makes it easier to align the room geometry and loudspeaker system correctly.

By default in EASE:

Listener seats are automatically oriented at a horizontal angle of 180°, meaning they are already facing toward the stage.
Loudspeakers, however, are initially aimed along the negative Y-axis, so their orientation usually needs to be adjusted during setup.

To begin the modeling process, switch to the Parallel + Plan (Z) view. This top-down view provides the clearest overview of the venue layout and allows room boundaries and audience areas to be drawn with high accuracy.

In this view, we will use the Polygon tool to create the main room surfaces, beginning with the stage area and the mezzanine level.

When drawing these areas, pay close attention to the dimensions and corner points shown in the attached floor plan. Accurate geometry at this stage is important because all additional room elements will later be aligned to these reference shapes.

Building the geometry step by step in this organized way helps maintain a clean and accurate model throughout the entire project.

Using the section drawing as a reference, move both Faces along the Z-axis to their correct heights. This step sets the vertical position of the surfaces according to the elevation shown in the section view.

The Faces will be positioned at approximately +1’7” and -1’7” on the Z-axis, which is about +0.48 m and -0.48 m.

To create the sloped orchestra floor, we will first create a new Face that extends slightly beyond one half of the orchestra area. Extending the geometry a little further than necessary helps ensure clean intersections and simplifies the later editing process.

To make this step easier, locate the Floorplan drawing in the project and temporarily switch its visibility OFF. This provides a clearer view of the section drawing and reduces visual clutter while tracing the sloped surface.

After placing the second vertex:

keep the cursor at the second vertex position
press X to continue moving towards the negative X-direction
then press Y and click on the first vertex
finally, press C to close the Polygon

This creates the sloped orchestra floor Face based on the dimensions and slope shown in the section drawing.

Its exact shape does not have to be rectangular, as long as it mostly covers that half of the orchestra floor, it will work.

Now use the Polygon in Face tool to cut the orchestra floor shape out of the sloped surface. This allows the exact floor outline to be projected directly onto the inclined Face while preserving the correct slope and elevation.

Begin by hovering over the first vertex along the mezzanine edge on the right side of the model. Press Z to constrain the cursor movement vertically, then press F2 to activate snapping onto the Face.

You will notice that snapping works even when the selected vertex is located outside the actual Face area. Once F2 snapping is enabled, the cursor displays two magenta circles indicating where the vertical projection line intersects the sloped surface. Click to place the first point on the Face.

Continue tracing the entire orchestra floor perimeter point by point until the full outline is complete. Since Face snapping remains active after pressing F2, you do not need to activate it again for each vertex.

When you reach the center stage area:

press Y
select the first vertex to create the center line
then close the Polygon

This operation cuts the orchestra floor shape directly into the sloped surface and creates the final inclined audience floor geometry.

After completing the cut, the sloped orchestra floor shape is now fully integrated into the main surface geometry. The remaining outer portion of the original Face is no longer needed and can be deleted.

Next, create the vertical Faces around the perimeter of the orchestra floor. These Faces will form the side boundaries of the sloped audience area and connect the inclined floor to the surrounding geometry. Since all required vertices already exist from the previous construction steps, the new Faces can be created quickly by following the existing edges and snapping directly to the available points.

At this stage, continue building the remaining room geometry, including:

the back entrance areas
the side entrances
and any connecting wall sections required to close the venue shape

Use the attached reference images to verify the correct placement, heights, and alignment of these architectural details. Working carefully through these final geometry elements ensures that the room model remains watertight and acoustically accurate.

Once the geometry on the positive X side is complete, use Mirror-X to duplicate the entire structure onto the negative X side. This automatically creates the second half of the venue and completes the full room geometry.

After mirroring, a visible center line will remain where both halves connect. For a cleaner result, use Join Faces to merge the two center Faces and remove this line.

The room geometry is now complete and ready for the next modeling steps.