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Combat: RESTORE authentic fire-at-nothing + non-mech range axis (task #50 / Discord report)

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Determined the authentic behavior from the decomp (HudSimulation + Emitter,
part_013.c:5619-5670 / 7689-7778) and fixed two regressions the players hit:
 (A) You could only fire when a MECH was locked (couldn't fire at nothing).
 (B) Buildings/structures/ground stopped moving the range axis; only mechs did.

AUTHENTIC (T1): a weapon discharges iff the target slot mech+0x388 != 0
(Emitter::FireWeapon FUN_004bace8:7727), and 0x388 is whatever the BORESIGHT
designates -- mech OR world geometry -- NOT a manual mech lock.  The RANGE readout
(HUD+0x1ec) moves for ANY designated target (mech OR structure/ground); the LOCK
ring is mech-only (target has a damage-zone table, HudSim :5619).  So the pod
'fired freely at nothing' and buildings moved the range caret.

ROOT CAUSES (both content-triggered, not a targeting-code change):
 1. arena1's ONLY class-42 world entity is the 10000x10000 FLAT GROUND plane at
    y=0, MISNAMED 'sky' -- SkippedName filtered it out by name, so BuildTables
    ingested 0 geometry and gBTTerrainEntity stayed null -> nothing groundable ->
    mech-only targeting.  (LAST.EGG rewrite ~bb795e2 lost whatever terrain the
    working scene had.)
 2. A boresight that hit nothing set MECH_TARGET_ENTITY=0 -> no discharge.

FIXES:
 - btvisgnd.cpp: geometry-aware skip -- keep a wide, near-flat, near-ground plane
   even if name-skipped (it is the arena floor); still skip true domes/backdrops.
   Adds mesh y-bounds.  arena1 now ingests 1 ground instance (was 0).
 - btl4vid.cpp: capture ANY world-geometry entity as the non-mech pick sentinel
   (the default render case is world-only), not only Terrain-derived ones.
 - mech4.cpp: FIRE-AT-NOTHING -- when nothing pickable is hit, designate a
   max-range point (1200, the HUD default 0x44960000) along the boresight using
   the world sentinel, so 0x388 != 0 and the weapon discharges (no zone damage /
   no lock ring, since the sentinel has no damage-zone table -- mechs only).

Verified autonomous: arena1 ground ingested; [target] shows 'fire-at-nothing
(max-range designate)'; weapon discharges at empty space ([fire] explode
resolved); range axis (sShownRange->BTSetHudTargetRange) slides to the designated
distance.  Diagnostic: BT_GROUND_LOG (world-geometry ingest + skip reasons).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
arcattack
2026-07-15 09:10:48 -05:00
co-authored by Claude Opus 4.8
parent 49d73dc8e2
commit ee6e19e86e
3 changed files with 82 additions and 8 deletions
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game/reconstructed/btvisgnd.cpp
+41 -4
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@@ -53,6 +53,7 @@ struct VgMesh
{
std::vector<VgTri> tris;
float minx, maxx, minz, maxz; // model-local XZ bound
float miny, maxy; // model-local Y bound (dome vs flat-ground test)
};
struct VgInst
@@ -89,8 +90,8 @@ int LoadMeshFor(const char *resource_name)
if (LoadBgfFile(file, data) && data.ok && !data.indices.empty())
{
VgMesh m;
m.minx = m.minz = 1e9f;
m.maxx = m.maxz = -1e9f;
m.minx = m.minz = m.miny = 1e9f;
m.maxx = m.maxz = m.maxy = -1e9f;
// The loader emits DOUBLE-SIDED triangles: emitTri pushes (a,b,c) then
// (a,c,b) -- 6 indices per source triangle. Take the forward one.
for (size_t i = 0; i + 5 < data.indices.size(); i += 6)
@@ -100,17 +101,33 @@ int LoadMeshFor(const char *resource_name)
const BgfVtx &C = data.verts[data.indices[i + 2]];
VgTri t = { A.x, A.y, A.z, B.x, B.y, B.z, C.x, C.y, C.z };
m.tris.push_back(t);
float xs[3] = { A.x, B.x, C.x }, zs[3] = { A.z, B.z, C.z };
float xs[3] = { A.x, B.x, C.x }, zs[3] = { A.z, B.z, C.z }, ys[3] = { A.y, B.y, C.y };
for (int k = 0; k < 3; ++k)
{
if (xs[k] < m.minx) m.minx = xs[k];
if (xs[k] > m.maxx) m.maxx = xs[k];
if (zs[k] < m.minz) m.minz = zs[k];
if (zs[k] > m.maxz) m.maxz = zs[k];
if (ys[k] < m.miny) m.miny = ys[k];
if (ys[k] > m.maxy) m.maxy = ys[k];
}
}
if (!m.tris.empty())
{
if (getenv("BT_GROUND_LOG"))
{
float miny = 1e9f, maxy = -1e9f;
for (size_t j = 0; j < m.tris.size(); ++j)
{
const VgTri &t = m.tris[j];
const float ys[3] = { t.ay, t.by, t.cy };
for (int k = 0; k < 3; ++k)
{ if (ys[k] < miny) miny = ys[k]; if (ys[k] > maxy) maxy = ys[k]; }
}
DEBUG_STREAM << "[visgnd] mesh '" << key << "' tris=" << m.tris.size()
<< " x[" << m.minx << "," << m.maxx << "] z[" << m.minz << "," << m.maxz
<< "] y[" << miny << "," << maxy << "]\n" << std::flush;
}
gMeshes.push_back(m);
idx = (int)gMeshes.size() - 1;
}
@@ -156,11 +173,31 @@ bool BuildTables()
ResourceDescription *rd = rf->FindResourceDescription(rid);
if (rd == 0) continue;
if (SkippedName(rd->resourceName)) { ++skipped; continue; }
int mi = LoadMeshFor(rd->resourceName);
if (mi < 0) { ++skipped; continue; }
// GEOMETRY-AWARE skip: the name filter (sky/backdrop) is right for a high
// vertical DOME, but arena1's ground is a 10000x10000 FLAT plane at y=0
// misnamed "sky" -- name-skipping it removed the only groundable geometry
// (task #50: buildings/ground stopped moving the range axis). Keep a
// name-skipped mesh IF it is a wide, near-flat, near-ground plane (the
// arena floor); still skip true domes / tall vertical backdrops.
if (SkippedName(rd->resourceName))
{
const VgMesh &gm = gMeshes[mi];
const float yext = gm.maxy - gm.miny;
const float xext = gm.maxx - gm.minx, zext = gm.maxz - gm.minz;
const bool flatWideGround =
(yext < 200.0f) && (xext > 500.0f) && (zext > 500.0f) && (gm.miny < 200.0f);
if (getenv("BT_GROUND_LOG"))
DEBUG_STREAM << "[visgnd] name-skip '" << rd->resourceName
<< "' yext=" << yext << " xz=" << xext << "x" << zext
<< " miny=" << gm.miny << " -> keepAsGround=" << (flatWideGround?1:0)
<< "\n" << std::flush;
if (!flatWideGround) { ++skipped; continue; }
}
VgInst inst;
inst.mesh = mi;
inst.px = pos[0]; inst.py = pos[1]; inst.pz = pos[2];