@Override
    public String toString() {
        return "Material[name=" + name +
                ", def=" + (def != null ? def.getName() : null) +
                ", tech=" + (technique != null && technique.getDef() != null ? technique.getDef().getName() : null) +
                "]";
    }
Called by {@link RenderManager} to render the geometry by
using this material.

Note that this version of the render method
does not perform light filtering.

@param geom The geometry to render
@param rm The render manager requesting the rendering
jme3-core/src/main/java/com/jme3/material/Material.java