Fredrik,
Unfortunately the lighting normals are only for the one face and thus back faces don't get colored "properly". As far as I know the only solution is to cull backfaces and build duplicate geometry to model the back face properly.
- John Wright Starfire Research
Fredrik Andersson wrote:
Hello!
I got a Canvas3D with some light, DirectionalLight. I do not think there is any strange with that.
But when I add an Shape3D and set the Appearance something like this:
appearance = createMaterialAppearance(new Color3f(colors[0], colors[1], colors[2]));
GeometryInfo gi = null; NormalGenerator ng = new NormalGenerator(); Stripifier st = new Stripifier(); gi = new GeometryInfo( GeometryInfo.POLYGON_ARRAY );
gi.setCoordinates(cordinates3D[i]); int[] stripCount = { cordinates3D[i].length/3 }; gi.setStripCounts(stripCount);
shapes3Ds[i] = new Shape3D(); shapes3Ds[i].setAppearance( appearance );
ng.generateNormals(gi); gi.recomputeIndices();
st.stripify(gi); gi.recomputeIndices();
shapes3Ds[i].setGeometry(gi.getGeometryArray());
and below is how I create the apperance:
public Appearance createMaterialAppearance(Color3f color) { Appearance materialAppear = new Appearance(); PolygonAttributes polyAttrib = new PolygonAttributes(); polyAttrib.setCullFace(PolygonAttributes.CULL_NONE); materialAppear.setPolygonAttributes(polyAttrib);
Material material = new Material(); material.setDiffuseColor(color); materialAppear.setMaterial(material);
return materialAppear; }
How ever when I rotate the Shape3D the object is black on the backside. I thought that when the other side is exposed for the light it would reflect the same color as the front side.
So if any one could explain why and how to solve it it would be great. I hope you got all the info you need. My guess is that the problem is in how i create the appearance.
Best regards Fredrik
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