Sculpt Mode

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The process of sculpting a Landscape involves using one or more tools that modify the underlying heightmap. These tools range from the simple Sculpt tool to other tools that use complex algorithms to apply interesting effects to the heightmap, such as erosion. Each tool has a set of properties that determine how the tool affects the Landscape.

Landscape Paint Mode also works in the VR Editor. For the controls for using Landscape in VR, see the VR Editor Controls .

The currently selected tool determines the operation that will be performed on the Landscape. The tools use brushes to apply their effects using strokes.

Common Controls

Operation

Left Mouse Button

Performs a stroke that applies the selected tool's effects to the heightmap.

Ctrl + Z

Undoes last stroke.

Ctrl + Y

Redoes last undone stroke.

For a quick reference guide to the Landscape tool's various modes, tools, and brushes, see Landscape UI Reference .

Sculpting Tools

You can use the Sculpting Tools to modify the shape of your Landscape in various ways.

Sculpt

Sculpt Tool

The Sculpt tool increases or decreases the heightmap height in the shape of the currently selected brush and falloff.

Alternate Controls

Operation

Left Mouse Button

Heightens or increases the heightmap or selected layer's weight.

Shift + Left Mouse Button

Lowers or decreases the heightmap or selected layer's weight.

Options:

Option

Description

Tool Strength

Controls how much effect each brush stroke has.

The brush strength determines the amount of raising or lowering.

Smooth

Smooth Tool

The Smooth tool smooths the heightmap. The strength determines the amount of smoothing.

Heightmap Smoothing

Landscape_Smooth_Before.jpg

Landscape_Smooth_After_HighDetail.jpg

Option

Description

Tool Strength

Controls how much smoothing occurs with each brush stroke has.

Filter Kernel Scale

Sets the scale multiplier for the smoothing filter kernel.

Detail Smooth

If checked, performs a detail-preserving smoothing using the specified detail-smoothing value. Larger-detail smoothing values remove more details, while smaller values preserve more details.

Landscape_Smooth_After_LowDetail.jpg

Landscape_Smooth_Before.jpg

Flatten

Flatten Tool

The Flatten tool flattens the Landscape to the level of the Landscape under the mouse cursor when you first activate the tool.

Landscape_Original.jpg

Landscape_Flatten.jpg

Option

Description

Tool Strength

Controls how much smoothing occurs with each brush stroke has.

Flatten Mode

Determines whether the tool will raise or lower the heightmap section under the brush.

Use Slope Flatten

If checked, flattens along the Landscape's existing slope instead of flattening toward a horizontal plane.

Pick Value Per Apply

If checked, constantly selects new values to flatten toward, instead of only using the first clicked point.

Flatten Target

Sets the target height toward which to flatten.

Ramp

Ramp Tool

The Ramp tool enables you to select two locations on your Landscape and create a flat ramp between them, with a falloff you specify on the sides.

To add a ramp to your Landscape:

  1. Ctrl + Left-click in two locations to mark the beginning and end points of the ramp.

    Ramp Setup

  2. If necessary, adjust the options you want for the ramp's width and falloff.

    Ramp Settings

  3. Click Add Ramp to create the ramp.

    Add Ramp

    Ramp Added

Ramp Tool Before

Ramp Tool After

If you change your mind about adding a ramp after starting to set the beginning and end points, you can click Reset to clear them.

Option

Description

Ramp Width

Sets the width of the ramp.

Side Falloff

Sets the falloff on the sides of the ramp, where it merges into the rest of the Landscape. A setting of 0 means no falloff; a setting of 1 means all falloff and no flat ramp.

Erosion

Erosion Tool

The Erosion tool uses a thermal erosion simulation to adjust the height of the heightmap. This simulates the transfer of soil from higher elevations to lower elevations. The larger the difference in elevation, the more erosion will occur. This tool also applies a noise effect on top of the erosion, if desired, to provide a more natural random appearance.

Landscape_Original.jpg

Landscape_Thermal_Erosion.jpg

Option

Description

Tool Strength

Controls how much effect each brush stroke has.

Threshold

The minimum height difference necessary for the erosion effects to be applied. Smaller values will result in more erosion being applied.

Surface Thickness

The thickness of the surface for the layer weight erosion effect.

Iterations

The number of iterations performed. Larger values result in more levels of erosion.

Noise Mode

Whether to apply noise to raise or lower the heightmap, or do both.

Noise Scale

The size of the noise filter used. The noise filter is related to position and scale, which means if you do not change Noise Scale, the same filter is applied to the same position many times.

Erosion_New.jpg

Hydro Erosion

Hydro Erosion Tool

The Hydro Erosion tool uses a hydraulic erosion simulation, i.e. erosion from water, to adjust the height of the heightmap. A noise filter is used to determine where the initial rain is distributed. Then the simulation is calculated to determine water flow from that initial rain as well as dissolving, water transfer, and evaporation. The result of that calculation provides the actual value used to lower the heightmap.

Landscape_Original.jpg

Landscape_Hydraulic_Erosion.jpg

Option

Description

Tool Strength

Controls how much effect each brush stroke has.

Rain Amount

The amount of rain to apply to the surface. Larger values will result in more erosion.

Sediment Cap.

The amount of sediment that the water can carry. Larger values will result in more erosion.

Iterations

The number of iterations performed. Larger values result in more levels of erosion.

Initial Rain Distribution

Whether rain is applied only where the noise filter is positive, or to the entire area.

Hydro_Erosion.jpg

Rain Dist Scale

The size of the noise filter for applying initial rain to the surface. The noise filter is related to position and scale, which means if you do not change Rain Dist. Scale, the same filter is applied to the same position many times.

Detail Smooth

If checked, performs a detail-preserving smoothing to the erosion effect using the specified detail-smoothing value. Larger detail-smoothing values remove more details, while smaller values preserve more details.

Noise

Noise Tool

The Noise tool applies a noise filter to the heightmap or layer weight. The strength determines the amount of noise.

Option

Description

Tool Strength

Controls how much effect each brush stroke has.

Use Target Value

If checked, blends the values of the noise being applied toward a target value.

Noise Mode

Determines whether to apply all noise effects, only the noise effects that result in raising the heightmap, or only the noise effects that result in lowering the heightmap.

Noise.jpg

Noise Scale

The size of the perlin noise filter used. The noise filter is related to position and scale, which means if you do not change Noise Scale, the same filter is applied to the same position many times.

Retopologize

Retopologize Tool

The Retopologize tool automatically adjusts Landscape vertices with an X/Y offset map to improve vertex density on cliffs, reducing texture stretching.

An X/Y offset map makes the Landscape slower to render and paint on with other tools, so only use the Retopologize tool if needed.

Visibility

Visibility Tool

The Visibility tool enables you to create holes in your Landscape, such as for caves.

Alternate Controls

Operation

Shift + Left-click

Removes the visibility mask, making the Landscape components visible again.

Using Opacity Masking to Create a Hole

Although you can use the sculpting tools to create vertical holes in your Landscape, you may find that you also want to create horizontal ones, such as for caves. You can do so by using opacity masking to "paint" away the visibility of a section of your Landscape with the Visibility tool.

In order to paint away the visibility of a section of your Landscape, you must set up the Landscape Material correctly. For information about setting up a Landscape Hole Material, see Landscape Hole Materials .

If you use the Visibility tool without having a Landscape Hole Material assigned, the Visibility tool will remove the Material layers applied to the selected sections, but will not create a hole in the Landscape itself.

After you have set up your Landscape Hole Material, you can use the painting tools to create a hole in your Landscape.

To create a Landscape hole:

  1. Make sure you have a Landscape Hole Material assigned to your Landscape.

    Landscape_HoleSettings.png

  2. In the Landscape tool, in Sculpt mode, select the Visibility tool.

    Visibility Tool

  3. Find the location on your Landscape where you want to create a hole.

    Landscape_MountainNoCave.png

  4. Adjust the brush size and falloff appropriately.

    Landscape_MountainCaveMask.png

  5. Left-click to create the hole and Shift + Left-click to erase a hole that was created.

    Landscape_MountainHole.png

    You can now fit Static Mesh Actors in the hole in the Landscape to create a cave.

    To test out the collision of the new hole using Play In Editor (PIE), you may have to switch from Landscape mode to Place mode.

Region Tools

You can use the Region tools to perform actions on specific regions of the Landscape.

Region Selection

Region Selection Tool

The Region Selection tool selects regions of the Landscape using the current brush settings and tool strength to be used to fit a Landscape gizmo to a specific area or to act as a mask for copying data to, or pasting data from, a gizmo.

region_selection.jpg

Controls

Operation

Left Mouse Button

Adds to the selected region.

Shift + Left Mouse Button

Removes from the selected region.

Option

Description

Clear Region Selection

Clears the current selected region(s).

Tool Strength

Controls how much effect each brush stroke has.

Use Region as Mask

When checked, the region selection acts as a mask with the active area being comprised of the selected region.

region_mask.jpg

Negative Mask

When checked, and when Use Region as Mask is also checked, the region selection acts as a mask, but the active area is comprised of the unselected region.

region_mask_negative.jpg

Copy/Paste

Copy/Paste Tool

You can use this tool to copy height data from one area of a Landscape to another through the use of Landscape Gizmos . You can also import and export Gizmo data.