Paint on 3D models (Photoshop Extended)



You can use any Photoshop painting tools to paint directly on a 3D model just as you would on a 2D layer. Use selection tools to target specific model areas or let Photoshop identify and highlight paintable areas. 3D menu commands let you clear away areas of a model to access interior or hidden portions for painting.

When painting directly on the model, you can choose which underlying texture map to apply paint to. Typically paint is applied to the diffuse texture map, which gives a model material its color properties. You can also paint on other texture maps, such as the bump map or opacity map. If you paint on an area of the model that lacks the type of texture map you’re painting on, a texture map is automatically created.

  1. Use the 3D position tools to orient the model so that the area you want to paint on is facing forward.

    If the model area is hidden, you can temporarily cut away surface areas that are blocking your view. See Reveal surfaces to paint on.

    If you are painting on curved or irregular surfaces, you can get visual feedback before you paint of which areas can best receive paint. See Identify paintable areas. You can also set the paint fall-off angle, which controls the amount of paint applied to angled surfaces. See Set the paint falloff angle.

  2. Do one of the following to set the texture map to paint on:

    • Choose 3D > 3D Paint Mode, and select a map type.

    • In the 3D panel, select the Scene panel. Choose a map type from the Paint On menu.

    If you try to paint on a texture map type that the material doesn’t contain, Photoshop prompts you to create a map. For information on map types, see 3D Materials settings (Photoshop Extended).

  3. (Optional) Using any selection tool, create a selection on the 3D model to restrict the area that you want to paint on.

  4. Apply paint using the Paintbrush tool. You can also use any other tool in the second section of the Tools panel, such as the Paint Bucket, Smudge, Dodge, Burn, or Blur tools.

While painting (after completing a stroke), you can view the effect of the painting on the texture map itself. Do one of the following:

  • Double-click the texture map in the Layers panel to open it.

  • In the Materials section  of the 3D panel, select the material for the area you are painting. In the lower section of the panel, click the menu icon  for the texture map you’re painting, and choose Open Texture.

For a video on painting on the 3D model, see www.adobe.com/go/lrvid4005_ps.

Reveal surfaces to paint on

For more complex models with interior or hidden areas, you can hide sections of the model for easier access to surfaces you want to paint. For example, to apply paint to the dashboard of a car model, you can temporarily cut away the roof or windshield, then zoom inside the car to get an unobstructed view.

  1. Select an area of the model that you want to cut away, using a selection tool such as the Lasso or Marquee tool.

  2. Use any of the following 3D menu commands to reveal or hide areas of the model:
    Hide Nearest Surface
    hides only the first layer of model polygons within the 2D selection. To quickly peel away surfaces of the model, you can use this command repeatedly while keeping the selection area active.
    When hiding surfaces, rotate the model if necessary to position surfaces so that they are perpendicular to your current view.

    Only Hide Enclosed Polygons
    When selected, the Hide Nearest Surface command only affects polygons that are fully within the selection. When unchecked, it hides any polygons touched by the selection.

    Invert Visible Surfaces
    Makes currently visible surfaces invisible, and invisible surfaces visible.

    Reveal All Surfaces
    Makes all hidden surfaces visible again.

Set the paint falloff angle

When painting on a model, the paint falloff angle controls how much paint is applied to a surface as it curves away from the forward-facing view. The falloff angle is calculated based on a “normal”, or straight line projecting out from the part of the model surface that faces you. For example, in a spherical model such as a soccer ball, the falloff angle to the exact center of the ball as it faces you is 0 degrees. As the surface of the ball curves away, the falloff angle increases, up to 90 degrees at the edges of the ball.
A.
Eye/camera angle

B.
Minimum angle

C.
Maximum angle

D.
Paint fade start

E.
Paint fade end

  1. Choose 3D > 3D Paint Falloff

  2. Set the minimum and maximum angle settings.

    • The maximum paint falloff range is 0 - 90 degrees. At 0 degrees, paint is only applied to the surface if it is facing directly forward, with no drop-off angle. At 90 degrees, paint can follow a curved surface such as a sphere to its visible edges. At a 45 degree setting, the painted area is limited to the areas of the sphere that don’t curve away at more than 45 degrees.

    • The Minimum falloff angle sets a range within which paint gradually fades as it approaches the maximum falloff angle. For example, if the maximum falloff angle is 45, and the minimum falloff is 30, paint opacity decreases from 100 to 0 percent between 30 and 45 degrees of falloff.

Identify paintable areas

It may not be clear just from looking at a 3D model whether you can successfully paint on certain areas. Because the model view may not provide a 1 to 1 correspondence with the 2D texture itself, applying paint directly to the model is different from directly painting on a 2D texture map. What appears to be a small brush on the model may in fact be much larger in relation to the texture, depending on the resolution of the texture, or how close you are to the model when applying paint.

Good paintable areas are areas where you can apply paint or other adjustments to the model surface with the most consistent and predictable effect. In other areas, paint may be undersampled or oversampled due to your angle or distance from the model surface.

 Do one of the following:

  • Choose 3D > Select Paintable Areas. A selection marquee highlights the best areas for painting on the model.

  • In Scene section  of the 3D panel, choose Paint Mask from the Preset menu.

    In Paint Mask mode, white shows areas good for painting, blue shows areas where paint will be undersampled, and red shows areas where paint will be oversampled. (To paint on the model, you must change from the Paint Mask render mode to a render mode that supports painting, such as Solid.)

The areas selected by Select Paintable Areas, and the paintable areas shown in Paint Mask mode, are partially determined by the current Paint Falloff setting. A higher paint falloff setting increases the paintable area, a lower setting decreases the paintable area. See Set the paint falloff angle.