Restore ceiling plane in texture experiment

Author: sabino

Makefile

@@ -582,7 +582,7 @@ RENDER_EXPERIMENT_COMMON=DOOM_MAP=E1M1 DOOM_DETAIL=quality DOOM_SKIP_INTRO=1 DOO
 RENDER_EXPERIMENT_E1M1_ASSETS=DOOM_MONSTER_SPRITES=$(DOOM_E1M1_MULTIFLOOR_SPRITES) DOOM_SPRITE_SCALES=1.00,0.75,0.50,0.33,0.25 DOOM_CROM_FILE_BYTES=1048576
 
 EXPERIMENT_DESC_texture_columns=Generated STARTAN3 texture columns on the stable simple-map raycaster.
-EXPERIMENT_FLAGS_texture_columns=$(RENDER_EXPERIMENT_COMMON) $(RENDER_EXPERIMENT_E1M1_ASSETS) DOOM_SIMPLE_MAP=1 DOOM_CHUNKED_SIMPLE_MAP=0 DOOM_CEILING_PERSPECTIVE=0 DOOM_FLAT_PLANES=0
+EXPERIMENT_FLAGS_texture_columns=$(RENDER_EXPERIMENT_COMMON) $(RENDER_EXPERIMENT_E1M1_ASSETS) DOOM_SIMPLE_MAP=1 DOOM_CHUNKED_SIMPLE_MAP=0 DOOM_CEILING_PERSPECTIVE=1 DOOM_PLANE_FLOOR_FORWARD_PHASES=2 DOOM_PLANE_CEILING_FORWARD_PHASES=1 DOOM_BG_SCROLL_COLUMNS=20 DOOM_BG_SCROLL_OVERRUN_COLUMNS=20 DOOM_FLAT_PLANES=0
 EXPERIMENT_PROBES_texture_columns=simple-enemy-visibility-check
 
 EXPERIMENT_DESC_ripdoom_flat=Actual E1M1 RIPDOOM geometry, one wall layer, flat floor/ceiling backdrop.

docs/renderer-experiments.md

@@ -50,8 +50,8 @@ real hardware/performance tradeoff.
 `texture_columns`
 
 Generated STARTAN3 texture columns on the stable simple-map raycaster. Use this
-as the baseline for texture readability, column density, and classic floor
-motion before adding real WAD geometry.
+as the baseline for texture readability, column density, ceiling/floor plane
+motion, and full-frame backdrop refresh before adding real WAD geometry.
 
 `ripdoom_flat`