Procedural texturing of solid wood with knots

We present a procedural framework for modeling the annual ring pattern of solid wood with knots. Although texturing is well-studied topic, there have been few previous attempts at knots inside texture. Our method takes skeletal structure tree log as input and produces three-dimensional scalar field representing time added growth, which defines volumetric pattern. First, separate fields are computed around each strand skeleton, i.e., stem knot. The strands then merged into single using smooth minimums. further suggest techniques controlling minimum to adjust balance smoothness reproduce distortion effects observed dead implemented shader program running on GPU computation times approximately 0.5 s per image an data size 600 KB. rendered images from pine spruce well plywood cross-laminated timber (CLT). results were evaluated by experts, who confirmed plausibility patterns. Link code: https://github.com/marialarsson/procedural_knots.