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-**Field sampling**:
-- sample (nearest+clamp sample)
-- bilerp (bilinear+clamp sample)
-- superSample2x2 (anti-aliasing)
-
-**Vector math**:
-- normalizePow (use `normalizePow(x_ij, -2)` to calcuate gravity)
-
-**Painting helpers**:
-- paintArrow (simply feed the image tensor)
-- sdLine (SDF of a line segment)
-
-**Builtin images**:
-- imageTaichi (from `taichi/examples/taichi_logo.py`)
-- imageChess (NxN black-white checkers)
-- imageGrid (NxN black stroke grid)
-
-**Particle simulation**:
-- ballBoundReflect (often used in cloth simulation)
-
-**Color mapping**:
-- grayscale
-- normalmap
-
-**GUI base class**:
-- Set `self.auto_clean = True` to clear image before `on_render`.
-
-**Taichi hacks**:
-- Turn off the annoying deprecation warning by default.
-- No error on `vector = scalar`, use `vector.fill(scalar)` by default.
-- `vector.product()` to get the product of all elements.
-- `ti.static` now accept any argument types.