public void setLineWidth(float lineWidth) {
        if (lineWidth < 1f) {
            throw new IllegalArgumentException("lineWidth must be greater than or equal to 1.0");
        }
        this.lineWidth = lineWidth;
        this.applyLineWidth = true;
        cachedHashCode = -1;
    }
Sets the mesh line width.
Use this in conjunction with {@link #setWireframe(boolean)} or with a mesh in
{@link com.jme3.scene.Mesh.Mode#Lines} mode.
Note: this does not work in OpenGL core profile. It only works in
compatibility profile.

@param lineWidth the line width.
jme3-core/src/main/java/com/jme3/material/RenderState.java