“HAPPY BIRTHDAY” is a Glass Color text effect FontVibe AIで作成した文字エフェクト. 一文字ずつ違う宝石色の、厚く中身の詰まったガラス文字。明るい白いスタジオの床に色の光だまりとコースティクスの扇を落とします.

sculpted as thick solid colored glass letterforms — each letter formed from deep-saturated jewel-tone glass with visible material weight and depth. The glass holds intense color throughout its body: ruby red, sapphire blue, emerald green, amber gold, cyan, or violet — color set by scene context. Top surfaces carry sharp mirror-bright specular highlights; side edges reveal full glass thickness with bright refracted light lines. Internal light scatters creating subsurface color gradients — luminous at the core, deeply saturated at edges. Caustic light patterns (rainbow-edged refraction fans) radiate from letter bases onto surrounding surfaces. Style may range from smooth precision-cut optical glass sculpture (modern) to segmented cathedral stained glass (traditional lead-came divided jewel panes) — determined by font choice. The defining quality: saturated transparent color glowing with transmitted light, like jewels held to sunlight. HAPPY BIRTHDAY rendered as thick, solid jewel-tone colored glass typography within a bright white birthday studio set. Each letter carries a different saturated transparent hue cycling through ruby red, sapphire blue, emerald green, amber gold, violet, and cyan; the color is dense through the glass body, with luminous transmitted cores and darker saturated edge thickness. Mirror-bright specular highlights sweep across polished top planes, while beveled sides split the light into sharp refracted lines. Brilliant caustic refraction fans spill across the white floor in overlapping pools of red, blue, green, gold, and violet. Surrounding party details include translucent balloons with pearlescent reflections, curled metallic ribbon, scattered confetti discs, and a few clear acrylic gift boxes containing colored tissue paper. A small frosted birthday cake with unlit wax candles sits among the decoration, catching colored glass reflections on its icing. Softbox key lighting, clean high-key exposure, ray-traced glass dispersion, crisp contact shadows, product-photography finish, saturated gemstone color, detailed optical refraction.