AffineLinearMeshTransform.java

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package jarmos.geometry;

public class AffineLinearMeshTransform implements MeshTransform {

    private float[][] functions;

    private int[] vertexLTFuncNr;

    public AffineLinearMeshTransform(float[][] functions) {
        this(functions, null);
    }

    public AffineLinearMeshTransform(float[][] functions, int[] vertexLTFuncNr) {
        this.functions = functions;
        this.vertexLTFuncNr = vertexLTFuncNr;
    }

    @Override
    public float[] transformMesh(float[] vertices) {
        float[] res = new float[vertices.length];
        float baseX, baseY, baseZ;
        for (int vertexNr = 0; vertexNr < res.length / 3; vertexNr++) {
            baseX = vertices[vertexNr * 3 + 0];
            baseY = vertices[vertexNr * 3 + 1];
            baseZ = vertices[vertexNr * 3 + 2];
            /*
             * Get transformation function for this vertex (possibly due to different functions on different subdomains)
             */
            float[] fun = functions[0];
            if (vertexLTFuncNr != null) {
                fun = functions[vertexLTFuncNr[vertexNr]];
            }
            /*
             * Apply affine linear transformation
             */
            res[vertexNr * 3 + 0] = fun[0] * baseX + fun[1] * baseY + fun[2] * baseZ + fun[9];
            res[vertexNr * 3 + 1] = fun[3] * baseX + fun[4] * baseY + fun[5] * baseZ + fun[10];
            res[vertexNr * 3 + 2] = fun[6] * baseX + fun[7] * baseY + fun[8] * baseZ + fun[11];
        }
        return res;
    }
}