Function CDrawArmsImpl

Source/Objects/movementobject.cpp:1645–1939

};

static void CDrawArmsImpl(
    MovementObject& this_mo,
    RiggedObject& rigged_object,
    Skeleton& skeleton,
    float& breath_amount,
    float& max_speed,
    float& true_max_speed,
    int& idle_type,
    bool& on_ground,
    bool& flip_info_flipping,
    float& threat_amount,
    bool& ledge_info_on_ledge,
    CScriptArray* skeleton_bind_transforms,
    CScriptArray* inv_skeleton_bind_transforms,
    CScriptArray* ik_chain_start_index,
    CScriptArray* ik_chain_elements,
    CScriptArray* ik_chain_length,
    CScriptArray* key_transforms,
    CScriptArray* arm_points,
    CScriptArray* old_arm_points,
    CScriptArray* temp_old_arm_points,
    CScriptArray* bone_children,
    CScriptArray* bone_children_index,
    const BoneTransform& chest_transform, const BoneTransform& l_hand_transform, const BoneTransform& r_hand_transform, int num_frames) {
    // Get relative chest transformation
    int chest_bone = ASIKBoneStart(&skeleton, "torso");
    BoneTransform chest_frame_matrix = rigged_object.animation_frame_bone_matrices[chest_bone];
    BoneTransform chest_bind_matrix = *(BoneTransform*)skeleton_bind_transforms->At(chest_bone);
    BoneTransform rel_mat = chest_transform * invert(chest_frame_matrix * chest_bind_matrix);

    // Get points in arm IK chain transformed by chest
    float upper_arm_length[2];
    float upper_arm_weight[2];
    float lower_arm_length[2];
    float lower_arm_weight[2];
    vec3 chain_points[kNumArmPoints * 2];

    for (int right = 0; right < 2; ++right) {
        int chain_start = *(int*)ik_chain_start_index->At(kLeftArmIK + right);
        vec3 hand = GetTransformedBonePoint(&rigged_object, *(int*)ik_chain_elements->At(chain_start + 0), 1);
        vec3 wrist = GetTransformedBonePoint(&rigged_object, *(int*)ik_chain_elements->At(chain_start + 0), 0);
        vec3 elbow = GetTransformedBonePoint(&rigged_object, *(int*)ik_chain_elements->At(chain_start + 2), 0);
        vec3 shoulder = GetTransformedBonePoint(&rigged_object, *(int*)ik_chain_elements->At(chain_start + 4), 0);
        vec3 collar_tip = GetTransformedBonePoint(&rigged_object, *(int*)ik_chain_elements->At(chain_start + 5), 1);
        vec3 collar = GetTransformedBonePoint(&rigged_object, *(int*)ik_chain_elements->At(chain_start + 5), 0);

        // Get more metrics about arm lengths
        upper_arm_length[right] = distance(elbow, shoulder);
        lower_arm_length[right] = distance(wrist, elbow);

        vec3 mid_low_arm = GetTransformedBonePoint(&rigged_object, *(int*)ik_chain_elements->At(chain_start + 1), 0);
        vec3 mid_up_arm = GetTransformedBonePoint(&rigged_object, *(int*)ik_chain_elements->At(chain_start + 3), 0);

        lower_arm_weight[right] = distance(elbow, mid_low_arm) / distance(wrist, elbow);
        upper_arm_weight[right] = distance(shoulder, mid_up_arm) / distance(shoulder, elbow);

        BoneTransform world_chest = *(BoneTransform*)key_transforms->At(kChestKey) * *(BoneTransform*)inv_skeleton_bind_transforms->At(*(int*)ik_chain_start_index->At(kTorsoIK));
        vec3 breathe_dir = world_chest.rotation * normalize(vec3(0.0f, -0.3f, 1.0f));