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Decompile fn_01724 (ModelRotationTrack::Sample)

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Batch #16140 by youko: 0 byte-identical, 1 confirmed by peer review.

- fn_01724 ModelRotationTrack::Sample: logic confirmed by peer review

Peer-reviewed-by: ragnarok-clanker, Yommy, alisonrag
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
This commit is contained in:
ragnarok-clanker 2026-11-10 14:46:25 +00:00
commit 42e2b60018
1 changed files with 33 additions and 19 deletions
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52
Source/Contents/Models/ModelAnimation.cpp
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@ -234,6 +234,7 @@ void ModelRotationTrack::Sample(float frame, const matrix& base, matrix& output)
if (static_cast<float>(keys[next].frame) > frame) {
if (next == 0) {
a = MatrixQuaternion(base);
a.frame = 0;
} else {
a = keys[next - 1];
}
@ -243,14 +244,28 @@ void ModelRotationTrack::Sample(float frame, const matrix& base, matrix& output)
}
}
const float amount = b.frame != a.frame ? (frame - static_cast<float>(a.frame)) / static_cast<float>((b.frame - a.frame)) : 0.0f;
float dot = ((b.rotation[0] * a.rotation[0] + b.rotation[1] * a.rotation[1]) + b.rotation[2] * a.rotation[2]) + b.rotation[3] * a.rotation[3];
float amount = 0.0f;
if (b.frame != a.frame) {
amount = (frame - static_cast<float>(a.frame)) / static_cast<float>((b.frame - a.frame));
}
ModelRotationKey result{0, {0, 0, 0, 1}};
float ax = a.rotation[0];
float ay = a.rotation[1];
float az = a.rotation[2];
float aw = a.rotation[3];
float bx = b.rotation[0];
float by = b.rotation[1];
float bz = b.rotation[2];
float bw = b.rotation[3];
float dot = ((bx * ax + by * ay) + bz * az) + bw * aw;
if (dot < 0.0f) {
for (float& value : a.rotation) {
value = -value;
}
ax = -ax;
ay = -ay;
az = -az;
aw = -aw;
dot = -dot;
}
@ -258,29 +273,28 @@ void ModelRotationTrack::Sample(float frame, const matrix& base, matrix& output)
float secondWeight;
if (dot > -0.95f) {
if (dot <= 0.95f) {
if (dot > 0.95f) {
firstWeight = 1.0f - amount;
secondWeight = amount;
} else {
const float angle = static_cast<float>(std::acos(static_cast<double>(dot)));
const float denominator = ClientSin(angle);
firstWeight = ClientSin((1.0f - amount) * angle) / denominator;
secondWeight = ClientSin(angle * amount) / denominator;
} else {
firstWeight = 1.0f - amount;
secondWeight = amount;
}
} else {
b.rotation[0] = -a.rotation[1];
b.rotation[1] = a.rotation[0];
b.rotation[2] = -a.rotation[3];
b.rotation[3] = a.rotation[2];
bx = -ay;
by = ax;
bz = -aw;
bw = az;
firstWeight = ClientSin((0.5f - amount) * 3.141592f);
secondWeight = ClientSin(amount * 3.141592f);
}
ModelRotationKey result{0, {}};
result.rotation[0] = b.rotation[0] * secondWeight + firstWeight * a.rotation[0];
result.rotation[1] = b.rotation[1] * secondWeight + firstWeight * a.rotation[1];
result.rotation[2] = b.rotation[2] * secondWeight + a.rotation[2] * firstWeight;
result.rotation[3] = b.rotation[3] * secondWeight + a.rotation[3] * firstWeight;
result.rotation[0] = bx * secondWeight + firstWeight * ax;
result.rotation[1] = by * secondWeight + firstWeight * ay;
result.rotation[2] = bz * secondWeight + az * firstWeight;
result.rotation[3] = bw * secondWeight + aw * firstWeight;
QuaternionMatrix(result, rotation);
}