Initial commit: Minecraft 光追着色器包（从零实现的 path tracing）

shaders/item.properties

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+# MinecraftPT item.properties
+# Maps held items to light levels (for held light).
+
+item.torch = 14
+item.soul_torch = 14
+item.lantern = 15
+item.soul_lantern = 15
+item.end_rod = 14
+item.blaze_rod = 14
+item.glowstone = 15
+item.sea_lantern = 15
+item.shroomlight = 15
+item.magma_cream = 4
+item.fire_charge = 4
+item.lava_bucket = 15
+item.campfire = 14
+item.soul_campfire = 14
+item.candle = 9
+item.amethyst_cluster = 4
+item.small_amethyst_bud = 2
+item.medium_amethyst_bud = 3
+item.large_amethyst_bud = 4
+item.light = 15
+item.ochre_froglight = 15
+item.verdant_froglight = 15
+item.pearlescent_froglight = 15