Texture refers to the surface or quality of an object. Different textures can influence the design and make it very appealing or unimpressive. There are basically two types of texture. There is tactile which means touch. This all refers to the actual feel of a surface. The texture is indeed very suitable for three dimensional designs.
Melody is the succession of single tones or pitches perceived by the mind as a unity. Melody is the horizontal dimension in music, while harmony adds vertical perspective. Chords are the essential part of harmony. The harmony is the "vertical" relationship between simultaneous chords. So, harmony is the "vertical aspect" of music and melody the "horizontal".