Fry3DX 0.4: an easy 3D modeller

Shapes with live settings, shape editing, knife and hole tools, drawing
shapes onto other objects, combining objects (add / subtract / overlap),
copies, thickness, painting with stickers and layers, a Layout tab, a
Print tab with checks, packed .fry files with autosave, export to GLB,
glTF, FBX, OBJ, 3MF, STL and PLY, folders in Layers, its own crash
screen, and a website for GitHub Pages in docs/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NMSrd5oe1GpUD7E6d825KP

engine/shaders/box.frag

@@ -0,0 +1,20 @@
+#version 460
+#include "backend.glsl"
+PUSH_BLOCK {
+    mat4 viewProj;
+    vec4 center;
+    vec4 extents;
+    vec4 color;
+} pc;
+
+layout(location = 0) in vec3 v_normal;
+layout(location = 1) in vec3 v_world;
+layout(location = 0) out vec4 o_color;
+
+void main() {
+    // World-space UVs: textures tile every 128 units regardless of box size.
+    vec3 n = abs(v_normal);
+    vec2 uv = (n.x > 0.5 ? v_world.yz : n.y > 0.5 ? v_world.xz : v_world.xy) / 128.0;
+    vec4 tex = sampleTex(uint(pc.center.w), uv);
+    o_color = vec4(pc.color.rgb * tex.rgb * sunLight(v_normal), 1.0);
+}