Class SoPhysicalMaterial

  • All Implemented Interfaces:

    public class SoPhysicalMaterial
    extends SoNode
    Physically based surface material definition node. This node defines the current physically based surface material properties for all subsequent shapes. The baseColor, specular, roughness, and metallic fields are taken into account during the rendering when the SoLighModel.model field is set to SoLightModel.PHYSICALLY_BASED.

    As described here, other property nodes can override the baseColor of this class.

    If lighting is turned off (SoLightModel set to BASE_COLOR), only the baseColor color is used to render geometry.

    # Override material

    To force all geometry following/below this node to use specific color and transparency values, call the setOverride() method with true. Overriding the base color overrides the color and transparency values in other nodes including SoPackedColor and SoVertexProperty. This can be useful, for example, to highlight a selected object.

    It is also possible to override only a subset of the SoPhysicalMaterial fields. If, for example, you only want to override the base color, but not the other values, call setIgnored(true) on the fields that you do not want to override.

    # VolumeViz shapes

    For scalar (non-RGBA) volumes, the color and alpha value of a voxel is affected by two nodes. SoPhysicalMaterial's baseColor field specifies the "base" color and alpha values for all voxels. SoTransferFunction specifies color and alpha values based on the voxel value. The final voxel color and alpha (before lighting and other effects) is computed by multiplying these two color and alpha values. The default material is (0.8, 0.8, 0.8, 1) (fully opaque gray). The 0.8 value for R, G and B allows lighting to increase the brightness of the voxel. For slice rendering without lighting, the application may want to set the material to 1, 1, 1, 1 so that only the SoTransferFunction affects the voxel color and alpha. Effectively the alpha value of baseColor (aka transparency) is a "global" multiplier that can increase or decrease the transparency of all voxels in the volume.

    File format/default:

    PhysicalMaterial {

      baseColor 0.8 0.8 0.8 1
      specular 0
      roughness 0.8
      metallic 0

    Action behavior:

    SoGLRenderAction, SoCallbackAction Sets the base color, the specular coefficient, the roughness coefficient and the metallic coefficient of the current physically based material. Sets: SoMaterialElement

    See Also:
    SoMaterial, SoBaseColor, SoLightModel, SoMaterialBinding, SoVertexProperty
    • Field Detail

      • baseColor

        public final SoSFColorRGBA baseColor
        Base color of the surface. Default is 0.8 0.8 0.8 1.

        In physically based models, the base color mainly controls the diffuse reflectance. Diffuse reflectance plays the most important role in determining the appearance of an object. It is affected by the color of the incident light(s) and the angle of each incident light relative to the object's normal direction. (It is most intense where the incident light falls perpendicular to the surface.)

        As described here, this field is not the unique way to specify a base color in the scene graph.

      • specular

        public final SoSFFloat specular
        Specular coefficient of the surface. Values can range from 0.0 to 1.0. Default is 0.

        Specular reflection from an object produces highlights. Unlike diffuse reflection, the amount of specular reflection depends on the location of the camera - it is brightest along the direct angle of reflection. To see this, imagine looking at a metallic ball outdoors in the sunlight. As you move your head, the highlight created by the sunlight moves with you to some extent. However, if you move your head too much, you lose the highlight entirely.

        This field specifies the intensity of the reflected light. The roughness field controls the size of the highlight.

      • roughness

        public final SoSFFloat roughness
        Roughness coefficient of the surface. Values can range from 0.0 to 1.0. Default is 0.8.

        The roughness defines the quantity of irregularity on a surface, from a perfectly smooth surface (roughness = 0) to highly irregular micro-structure (roughness = 1). This value affects the specular reflection from a mirror-like reflection (roughness = 0) to a scattered reflection (roughness = 1).

      • metallic

        public final SoSFFloat metallic
        Metallic coefficient of the surface. Values can range from 0.0 to 1.0. Default is 0.

        This parameter controls the metallic appearance of a surface. Most of the time for pure metallic surfaces the parameter should be 1, and 0 for other surfaces. For hybrid surfaces (e.g. corroded metals) or for styling reasons, you can choose a value between 0 and 1.

    • Constructor Detail

      • SoPhysicalMaterial

        public SoPhysicalMaterial()