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luanti/src/client/mesh.cpp
Lars Müller 7ac5502fdf Fix handling of skinned meshes for nodes 
Second try after the revert in 8a28339 due to an unexpected regression.

- Rigidly animated models (e.g. the glTF frog node) were not working correctly,
  since cloning the mesh ignored the transformation matrices.
  Note that scaling the mesh needs to occur *after* transforming the vertices.
- Visual scale did not apply to skinned models,
  as resetting the animation overwrote scaled vertex data with static positions & normals.
  For backwards compatibility, we now apply a 10x scale to static, non-glTF models.

We now do scale static meshes, as the bug that caused meshes not to be scaled was limited to skeletally animated meshes,
hence we ought not to reproduce it for skinned meshes that do not take advantage of skeletal animations (e.g. current MTG doors).

However, glTF models (e.g. Wuzzy's eyeballs) up until recently were always affected due to technical reasons
(using skeletal animation for rigid animation).

Thus, to preserve behavior, we:

1. Do not apply 10x scale to glTF models.
2. Apply 10x scale to obj models.
3. Apply 10x scale to static x or b3d models, but not to animated ones.

See also: #16141
2025-05-20 18:37:33 +02:00

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
#include "mesh.h"
#include "IMeshBuffer.h"
#include "SSkinMeshBuffer.h"
#include "debug.h"
#include "log.h"
#include <cmath>
#include <iostream>
#include <IAnimatedMesh.h>
#include <SAnimatedMesh.h>
#include <IAnimatedMeshSceneNode.h>
#include "S3DVertex.h"
#include "SMesh.h"
#include "SMeshBuffer.h"
inline static void applyShadeFactor(video::SColor& color, float factor)
{
color.setRed(core::clamp(core::round32(color.getRed()*factor), 0, 255));
color.setGreen(core::clamp(core::round32(color.getGreen()*factor), 0, 255));
color.setBlue(core::clamp(core::round32(color.getBlue()*factor), 0, 255));
}
void applyFacesShading(video::SColor &color, const v3f normal)
{
/*
Some drawtypes have normals set to (0, 0, 0), this must result in
maximum brightness: shade factor 1.0.
Shade factors for aligned cube faces are:
+Y 1.000000 sqrt(1.0)
-Y 0.447213 sqrt(0.2)
+-X 0.670820 sqrt(0.45)
+-Z 0.836660 sqrt(0.7)
*/
float x2 = normal.X * normal.X;
float y2 = normal.Y * normal.Y;
float z2 = normal.Z * normal.Z;
if (normal.Y < 0)
applyShadeFactor(color, 0.670820f * x2 + 0.447213f * y2 + 0.836660f * z2);
else if ((x2 > 1e-3) || (z2 > 1e-3))
applyShadeFactor(color, 0.670820f * x2 + 1.000000f * y2 + 0.836660f * z2);
}
scene::IAnimatedMesh* createCubeMesh(v3f scale)
{
video::SColor c(255,255,255,255);
video::S3DVertex vertices[24] =
{
// Up
video::S3DVertex(-0.5,+0.5,-0.5, 0,1,0, c, 0,1),
video::S3DVertex(-0.5,+0.5,+0.5, 0,1,0, c, 0,0),
video::S3DVertex(+0.5,+0.5,+0.5, 0,1,0, c, 1,0),
video::S3DVertex(+0.5,+0.5,-0.5, 0,1,0, c, 1,1),
// Down
video::S3DVertex(-0.5,-0.5,-0.5, 0,-1,0, c, 0,0),
video::S3DVertex(+0.5,-0.5,-0.5, 0,-1,0, c, 1,0),
video::S3DVertex(+0.5,-0.5,+0.5, 0,-1,0, c, 1,1),
video::S3DVertex(-0.5,-0.5,+0.5, 0,-1,0, c, 0,1),
// Right
video::S3DVertex(+0.5,-0.5,-0.5, 1,0,0, c, 0,1),
video::S3DVertex(+0.5,+0.5,-0.5, 1,0,0, c, 0,0),
video::S3DVertex(+0.5,+0.5,+0.5, 1,0,0, c, 1,0),
video::S3DVertex(+0.5,-0.5,+0.5, 1,0,0, c, 1,1),
// Left
video::S3DVertex(-0.5,-0.5,-0.5, -1,0,0, c, 1,1),
video::S3DVertex(-0.5,-0.5,+0.5, -1,0,0, c, 0,1),
video::S3DVertex(-0.5,+0.5,+0.5, -1,0,0, c, 0,0),
video::S3DVertex(-0.5,+0.5,-0.5, -1,0,0, c, 1,0),
// Back
video::S3DVertex(-0.5,-0.5,+0.5, 0,0,1, c, 1,1),
video::S3DVertex(+0.5,-0.5,+0.5, 0,0,1, c, 0,1),
video::S3DVertex(+0.5,+0.5,+0.5, 0,0,1, c, 0,0),
video::S3DVertex(-0.5,+0.5,+0.5, 0,0,1, c, 1,0),
// Front
video::S3DVertex(-0.5,-0.5,-0.5, 0,0,-1, c, 0,1),
video::S3DVertex(-0.5,+0.5,-0.5, 0,0,-1, c, 0,0),
video::S3DVertex(+0.5,+0.5,-0.5, 0,0,-1, c, 1,0),
video::S3DVertex(+0.5,-0.5,-0.5, 0,0,-1, c, 1,1),
};
u16 indices[6] = {0,1,2,2,3,0};
scene::SMesh *mesh = new scene::SMesh();
for (u32 i=0; i<6; ++i)
{
scene::IMeshBuffer *buf = new scene::SMeshBuffer();
buf->append(vertices + 4 * i, 4, indices, 6);
// Set default material
buf->getMaterial().MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
buf->getMaterial().forEachTexture([] (auto &tex) {
tex.MinFilter = video::ETMINF_NEAREST_MIPMAP_NEAREST;
tex.MagFilter = video::ETMAGF_NEAREST;
});
// Add mesh buffer to mesh
mesh->addMeshBuffer(buf);
buf->drop();
}
scene::SAnimatedMesh *anim_mesh = new scene::SAnimatedMesh(mesh);
mesh->drop();
scaleMesh(anim_mesh, scale); // also recalculates bounding box
return anim_mesh;
}
template<typename F>
inline static void transformMeshBuffer(scene::IMeshBuffer *buf,
const F &transform_vertex)
{
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *)buf->getVertices();
for (u32 i = 0; i < vertex_count; i++) {
auto *vertex = (video::S3DVertex *)(vertices + i * stride);
transform_vertex(vertex);
}
buf->setDirty(scene::EBT_VERTEX);
buf->recalculateBoundingBox();
}
void scaleMesh(scene::IMesh *mesh, v3f scale)
{
if (mesh == NULL)
return;
aabb3f bbox{{0.0f, 0.0f, 0.0f}};
u32 mc = mesh->getMeshBufferCount();
for (u32 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
transformMeshBuffer(buf, [scale](video::S3DVertex *vertex) {
vertex->Pos *= scale;
});
// calculate total bounding box
if (j == 0)
bbox = buf->getBoundingBox();
else
bbox.addInternalBox(buf->getBoundingBox());
}
mesh->setBoundingBox(bbox);
}
void translateMesh(scene::IMesh *mesh, v3f vec)
{
if (mesh == NULL)
return;
aabb3f bbox{{0.0f, 0.0f, 0.0f}};
u32 mc = mesh->getMeshBufferCount();
for (u32 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
transformMeshBuffer(buf, [vec](video::S3DVertex *vertex) {
vertex->Pos += vec;
});
// calculate total bounding box
if (j == 0)
bbox = buf->getBoundingBox();
else
bbox.addInternalBox(buf->getBoundingBox());
}
mesh->setBoundingBox(bbox);
}
void setMeshBufferColor(scene::IMeshBuffer *buf, const video::SColor color)
{
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *) buf->getVertices();
for (u32 i = 0; i < vertex_count; i++)
((video::S3DVertex *) (vertices + i * stride))->Color = color;
buf->setDirty(scene::EBT_VERTEX);
}
void setMeshColor(scene::IMesh *mesh, const video::SColor color)
{
if (mesh == NULL)
return;
u32 mc = mesh->getMeshBufferCount();
for (u32 j = 0; j < mc; j++)
setMeshBufferColor(mesh->getMeshBuffer(j), color);
}
template <typename F>
static void applyToMesh(scene::IMesh *mesh, const F &fn)
{
u16 mc = mesh->getMeshBufferCount();
for (u16 j = 0; j < mc; j++) {
scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
char *vertices = reinterpret_cast<char *>(buf->getVertices());
for (u32 i = 0; i < vertex_count; i++)
fn(reinterpret_cast<video::S3DVertex *>(vertices + i * stride));
buf->setDirty(scene::EBT_VERTEX);
}
}
void colorizeMeshBuffer(scene::IMeshBuffer *buf, const video::SColor *buffercolor)
{
const u32 stride = getVertexPitchFromType(buf->getVertexType());
u32 vertex_count = buf->getVertexCount();
u8 *vertices = (u8 *) buf->getVertices();
for (u32 i = 0; i < vertex_count; i++) {
video::S3DVertex *vertex = (video::S3DVertex *) (vertices + i * stride);
video::SColor *vc = &(vertex->Color);
// Reset color
*vc = *buffercolor;
// Apply shading
applyFacesShading(*vc, vertex->Normal);
}
buf->setDirty(scene::EBT_VERTEX);
}
void setMeshColorByNormalXYZ(scene::IMesh *mesh,
const video::SColor &colorX,
const video::SColor &colorY,
const video::SColor &colorZ)
{
if (!mesh)
return;
auto colorizator = [=] (video::S3DVertex *vertex) {
f32 x = fabs(vertex->Normal.X);
f32 y = fabs(vertex->Normal.Y);
f32 z = fabs(vertex->Normal.Z);
if (x >= y && x >= z)
vertex->Color = colorX;
else if (y >= z)
vertex->Color = colorY;
else
vertex->Color = colorZ;
};
applyToMesh(mesh, colorizator);
}
void setMeshColorByNormal(scene::IMesh *mesh, const v3f &normal,
const video::SColor &color)
{
if (!mesh)
return;
auto colorizator = [normal, color] (video::S3DVertex *vertex) {
if (vertex->Normal == normal)
vertex->Color = color;
};
applyToMesh(mesh, colorizator);
}
template <float v3f::*U, float v3f::*V>
static void rotateMesh(scene::IMesh *mesh, float degrees)
{
degrees *= M_PI / 180.0f;
float c = std::cos(degrees);
float s = std::sin(degrees);
auto rotator = [c, s] (video::S3DVertex *vertex) {
auto rotate_vec = [c, s] (v3f &vec) {
float u = vec.*U;
float v = vec.*V;
vec.*U = c * u - s * v;
vec.*V = s * u + c * v;
};
rotate_vec(vertex->Pos);
rotate_vec(vertex->Normal);
};
applyToMesh(mesh, rotator);
}
void rotateMeshXYby(scene::IMesh *mesh, f64 degrees)
{
rotateMesh<&v3f::X, &v3f::Y>(mesh, degrees);
}
void rotateMeshXZby(scene::IMesh *mesh, f64 degrees)
{
rotateMesh<&v3f::X, &v3f::Z>(mesh, degrees);
}
void rotateMeshYZby(scene::IMesh *mesh, f64 degrees)
{
rotateMesh<&v3f::Y, &v3f::Z>(mesh, degrees);
}
void rotateMeshBy6dFacedir(scene::IMesh *mesh, u8 facedir)
{
u8 axisdir = facedir >> 2;
facedir &= 0x03;
switch (facedir) {
case 1: rotateMeshXZby(mesh, -90); break;
case 2: rotateMeshXZby(mesh, 180); break;
case 3: rotateMeshXZby(mesh, 90); break;
}
switch (axisdir) {
case 1: rotateMeshYZby(mesh, 90); break; // z+
case 2: rotateMeshYZby(mesh, -90); break; // z-
case 3: rotateMeshXYby(mesh, -90); break; // x+
case 4: rotateMeshXYby(mesh, 90); break; // x-
case 5: rotateMeshXYby(mesh, -180); break;
}
}
void recalculateBoundingBox(scene::IMesh *src_mesh)
{
aabb3f bbox{{0.0f, 0.0f, 0.0f}};
for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
scene::IMeshBuffer *buf = src_mesh->getMeshBuffer(j);
buf->recalculateBoundingBox();
if (j == 0)
bbox = buf->getBoundingBox();
else
bbox.addInternalBox(buf->getBoundingBox());
}
src_mesh->setBoundingBox(bbox);
}
bool checkMeshNormals(scene::IMesh *mesh)
{
u32 buffer_count = mesh->getMeshBufferCount();
for (u32 i = 0; i < buffer_count; i++) {
scene::IMeshBuffer *buffer = mesh->getMeshBuffer(i);
if (!buffer->getVertexCount())
continue;
// Here we intentionally check only first normal, assuming that if buffer
// has it valid, then most likely all other ones are fine too. We can
// check all of the normals to have length, but it seems like an overkill
// hurting the performance and covering only really weird broken models.
f32 length = buffer->getNormal(0).getLength();
if (!std::isfinite(length) || length < 1e-10f)
return false;
}
return true;
}
template<class VertexType, class SMeshBufferType>
static scene::IMeshBuffer *cloneMeshBuffer(scene::IMeshBuffer *mesh_buffer)
{
auto *v = static_cast<VertexType *>(mesh_buffer->getVertices());
u16 *indices = mesh_buffer->getIndices();
auto *cloned_buffer = new SMeshBufferType();
cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
mesh_buffer->getIndexCount());
// Rigidly animated meshes may have transformation matrices that need to be applied
if (auto *sbuf = dynamic_cast<scene::SSkinMeshBuffer *>(mesh_buffer)) {
transformMeshBuffer(cloned_buffer, [sbuf](video::S3DVertex *vertex) {
sbuf->Transformation.transformVect(vertex->Pos);
vertex->Normal = sbuf->Transformation.rotateAndScaleVect(vertex->Normal);
vertex->Normal.normalize();
});
}
return cloned_buffer;
}
scene::IMeshBuffer* cloneMeshBuffer(scene::IMeshBuffer *mesh_buffer)
{
switch (mesh_buffer->getVertexType()) {
case video::EVT_STANDARD:
return cloneMeshBuffer<video::S3DVertex, scene::SMeshBuffer>(mesh_buffer);
case video::EVT_2TCOORDS:
return cloneMeshBuffer<video::S3DVertex2TCoords, scene::SMeshBufferLightMap>(mesh_buffer);
case video::EVT_TANGENTS:
return cloneMeshBuffer<video::S3DVertexTangents, scene::SMeshBufferTangents>(mesh_buffer);
}
sanity_check(false);
return NULL;
}
scene::SMesh* cloneStaticMesh(scene::IMesh *src_mesh)
{
scene::SMesh* dst_mesh = new scene::SMesh();
for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
scene::IMeshBuffer *temp_buf = cloneMeshBuffer(
src_mesh->getMeshBuffer(j));
dst_mesh->addMeshBuffer(temp_buf);
dst_mesh->setTextureSlot(j, src_mesh->getTextureSlot(j));
temp_buf->drop();
}
return dst_mesh;
}
scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,
const f32 *uv_coords, float expand)
{
scene::SMesh* dst_mesh = new scene::SMesh();
for (u16 j = 0; j < 6; j++)
{
scene::IMeshBuffer *buf = new scene::SMeshBuffer();
buf->getMaterial().forEachTexture([] (auto &tex) {
tex.MinFilter = video::ETMINF_NEAREST_MIPMAP_NEAREST;
tex.MagFilter = video::ETMAGF_NEAREST;
});
dst_mesh->addMeshBuffer(buf);
buf->drop();
}
video::SColor c(255,255,255,255);
for (aabb3f box : boxes) {
box.repair();
box.MinEdge.X -= expand;
box.MinEdge.Y -= expand;
box.MinEdge.Z -= expand;
box.MaxEdge.X += expand;
box.MaxEdge.Y += expand;
box.MaxEdge.Z += expand;
// Compute texture UV coords
f32 tx1 = (box.MinEdge.X / BS) + 0.5;
f32 ty1 = (box.MinEdge.Y / BS) + 0.5;
f32 tz1 = (box.MinEdge.Z / BS) + 0.5;
f32 tx2 = (box.MaxEdge.X / BS) + 0.5;
f32 ty2 = (box.MaxEdge.Y / BS) + 0.5;
f32 tz2 = (box.MaxEdge.Z / BS) + 0.5;
f32 txc_default[24] = {
// up
tx1, 1 - tz2, tx2, 1 - tz1,
// down
tx1, tz1, tx2, tz2,
// right
tz1, 1 - ty2, tz2, 1 - ty1,
// left
1 - tz2, 1 - ty2, 1 - tz1, 1 - ty1,
// back
1 - tx2, 1 - ty2, 1 - tx1, 1 - ty1,
// front
tx1, 1 - ty2, tx2, 1 - ty1,
};
// use default texture UV mapping if not provided
const f32 *txc = uv_coords ? uv_coords : txc_default;
v3f min = box.MinEdge;
v3f max = box.MaxEdge;
video::S3DVertex vertices[24] =
{
// up
video::S3DVertex(min.X,max.Y,max.Z, 0,1,0, c, txc[0],txc[1]),
video::S3DVertex(max.X,max.Y,max.Z, 0,1,0, c, txc[2],txc[1]),
video::S3DVertex(max.X,max.Y,min.Z, 0,1,0, c, txc[2],txc[3]),
video::S3DVertex(min.X,max.Y,min.Z, 0,1,0, c, txc[0],txc[3]),
// down
video::S3DVertex(min.X,min.Y,min.Z, 0,-1,0, c, txc[4],txc[5]),
video::S3DVertex(max.X,min.Y,min.Z, 0,-1,0, c, txc[6],txc[5]),
video::S3DVertex(max.X,min.Y,max.Z, 0,-1,0, c, txc[6],txc[7]),
video::S3DVertex(min.X,min.Y,max.Z, 0,-1,0, c, txc[4],txc[7]),
// right
video::S3DVertex(max.X,max.Y,min.Z, 1,0,0, c, txc[ 8],txc[9]),
video::S3DVertex(max.X,max.Y,max.Z, 1,0,0, c, txc[10],txc[9]),
video::S3DVertex(max.X,min.Y,max.Z, 1,0,0, c, txc[10],txc[11]),
video::S3DVertex(max.X,min.Y,min.Z, 1,0,0, c, txc[ 8],txc[11]),
// left
video::S3DVertex(min.X,max.Y,max.Z, -1,0,0, c, txc[12],txc[13]),
video::S3DVertex(min.X,max.Y,min.Z, -1,0,0, c, txc[14],txc[13]),
video::S3DVertex(min.X,min.Y,min.Z, -1,0,0, c, txc[14],txc[15]),
video::S3DVertex(min.X,min.Y,max.Z, -1,0,0, c, txc[12],txc[15]),
// back
video::S3DVertex(max.X,max.Y,max.Z, 0,0,1, c, txc[16],txc[17]),
video::S3DVertex(min.X,max.Y,max.Z, 0,0,1, c, txc[18],txc[17]),
video::S3DVertex(min.X,min.Y,max.Z, 0,0,1, c, txc[18],txc[19]),
video::S3DVertex(max.X,min.Y,max.Z, 0,0,1, c, txc[16],txc[19]),
// front
video::S3DVertex(min.X,max.Y,min.Z, 0,0,-1, c, txc[20],txc[21]),
video::S3DVertex(max.X,max.Y,min.Z, 0,0,-1, c, txc[22],txc[21]),
video::S3DVertex(max.X,min.Y,min.Z, 0,0,-1, c, txc[22],txc[23]),
video::S3DVertex(min.X,min.Y,min.Z, 0,0,-1, c, txc[20],txc[23]),
};
u16 indices[] = {0,1,2,2,3,0};
for(u16 j = 0; j < 24; j += 4)
{
scene::IMeshBuffer *buf = dst_mesh->getMeshBuffer(j / 4);
buf->append(vertices + j, 4, indices, 6);
}
}
return dst_mesh;
}
void setMaterialFilters(video::SMaterialLayer &tex, bool bilinear, bool trilinear, bool anisotropic)
{
if (trilinear)
tex.MinFilter = video::ETMINF_LINEAR_MIPMAP_LINEAR;
else if (bilinear)
tex.MinFilter = video::ETMINF_LINEAR_MIPMAP_NEAREST;
else
tex.MinFilter = video::ETMINF_NEAREST_MIPMAP_NEAREST;
tex.MagFilter = (trilinear || bilinear) ? video::ETMAGF_LINEAR : video::ETMAGF_NEAREST;
tex.AnisotropicFilter = anisotropic ? 0xFF : 0;
}
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