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/*******************************************************************************************
*
* raylib [core] example - Using bones as socket for calculating the positioning of something
*
* Example originally created with raylib 4.5, last time updated with raylib 4.5
*
* Example contributed by iP (@ipzaur) and reviewed by Ramon Santamaria (@raysan5)
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2024 iP (@ipzaur)
*
********************************************************************************************/
#include "raylib.h"
#include "raymath.h"
#define BONE_SOCKETS 3
#define BONE_SOCKET_HAT 0
#define BONE_SOCKET_HAND_R 1
#define BONE_SOCKET_HAND_L 2
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [models] example - bone socket");
// Define the camera to look into our 3d world
Camera camera = { 0 };
camera.position = (Vector3){ 5.0f, 5.0f, 5.0f }; // Camera position
camera.target = (Vector3){ 0.0f, 2.0f, 0.0f }; // Camera looking at point
camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
camera.fovy = 45.0f; // Camera field-of-view Y
camera.projection = CAMERA_PERSPECTIVE; // Camera projection type
// Load gltf model
Model characterModel = LoadModel("resources/models/gltf/greenman.glb"); // Load character model
Model equipModel[BONE_SOCKETS] = {
LoadModel("resources/models/gltf/greenman_hat.glb"), // Index for the hat model is the same as BONE_SOCKET_HAT
LoadModel("resources/models/gltf/greenman_sword.glb"), // Index for the sword model is the same as BONE_SOCKET_HAND_R
LoadModel("resources/models/gltf/greenman_shield.glb") // Index for the shield model is the same as BONE_SOCKET_HAND_L
};
bool showEquip[3] = { true, true, true }; // Toggle on/off equip
// Load gltf model animations
int animsCount = 0;
unsigned int animIndex = 0;
unsigned int animCurrentFrame = 0;
ModelAnimation *modelAnimations = LoadModelAnimations("resources/models/gltf/greenman.glb", &animsCount);
// indices of bones for sockets
int boneSocketIndex[BONE_SOCKETS] = { -1, -1, -1 };
// search bones for sockets
for (int i = 0; i < characterModel.boneCount; i++)
{
if (TextIsEqual(characterModel.bones[i].name, "socket_hat"))
{
boneSocketIndex[BONE_SOCKET_HAT] = i;
continue;
}
if (TextIsEqual(characterModel.bones[i].name, "socket_hand_R"))
{
boneSocketIndex[BONE_SOCKET_HAND_R] = i;
continue;
}
if (TextIsEqual(characterModel.bones[i].name, "socket_hand_L"))
{
boneSocketIndex[BONE_SOCKET_HAND_L] = i;
continue;
}
}
Vector3 position = { 0.0f, 0.0f, 0.0f }; // Set model position
unsigned short angle = 0; // Set angle for rotate character
DisableCursor(); // Limit cursor to relative movement inside the window
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
UpdateCamera(&camera, CAMERA_THIRD_PERSON);
// Rotate character
if (IsKeyDown(KEY_F)) angle = (angle + 1)%360;
else if (IsKeyDown(KEY_H)) angle = (360 + angle - 1)%360;
// Select current animation
if (IsKeyPressed(KEY_T)) animIndex = (animIndex + 1)%animsCount;
else if (IsKeyPressed(KEY_G)) animIndex = (animIndex + animsCount - 1)%animsCount;
// Toggle shown of equip
if (IsKeyPressed(KEY_ONE)) showEquip[BONE_SOCKET_HAT] = !showEquip[BONE_SOCKET_HAT];
if (IsKeyPressed(KEY_TWO)) showEquip[BONE_SOCKET_HAND_R] = !showEquip[BONE_SOCKET_HAND_R];
if (IsKeyPressed(KEY_THREE)) showEquip[BONE_SOCKET_HAND_L] = !showEquip[BONE_SOCKET_HAND_L];
// Update model animation
ModelAnimation anim = modelAnimations[animIndex];
animCurrentFrame = (animCurrentFrame + 1)%anim.frameCount;
UpdateModelAnimation(characterModel, anim, animCurrentFrame);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginMode3D(camera);
// Draw character
Quaternion characterRotate = QuaternionFromAxisAngle((Vector3){ 0.0f, 1.0f, 0.0f }, angle*DEG2RAD);
characterModel.transform = MatrixMultiply(QuaternionToMatrix(characterRotate), MatrixTranslate(position.x, position.y, position.z));
UpdateModelAnimation(characterModel, anim, animCurrentFrame);
DrawMesh(characterModel.meshes[0], characterModel.materials[1], characterModel.transform);
// Draw equipments (hat, sword, shield)
for (int i = 0; i < BONE_SOCKETS; i++)
{
if (!showEquip[i]) continue;
Transform *transform = &anim.framePoses[animCurrentFrame][boneSocketIndex[i]];
Quaternion inRotation = characterModel.bindPose[boneSocketIndex[i]].rotation;
Quaternion outRotation = transform->rotation;
// Calculate socket rotation (angle between bone in initial pose and same bone in current animation frame)
Quaternion rotate = QuaternionMultiply(outRotation, QuaternionInvert(inRotation));
Matrix matrixTransform = QuaternionToMatrix(rotate);
// Translate socket to its position in the current animation
matrixTransform = MatrixMultiply(matrixTransform, MatrixTranslate(transform->translation.x, transform->translation.y, transform->translation.z));
// Transform the socket using the transform of the character (angle and translate)
matrixTransform = MatrixMultiply(matrixTransform, characterModel.transform);
// Draw mesh at socket position with socket angle rotation
DrawMesh(equipModel[i].meshes[0], equipModel[i].materials[1], matrixTransform);
}
DrawGrid(10, 1.0f);
EndMode3D();
DrawText("Use the T/G to switch animation", 10, 10, 20, GRAY);
DrawText("Use the F/H to rotate character left/right", 10, 35, 20, GRAY);
DrawText("Use the 1,2,3 to toggle shown of hat, sword and shield", 10, 60, 20, GRAY);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadModelAnimations(modelAnimations, animsCount);
UnloadModel(characterModel); // Unload character model and meshes/material
// Unload equipment model and meshes/material
for (int i = 0; i < BONE_SOCKETS; i++) UnloadModel(equipModel[i]);
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
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