diff --git a/src/include/sdk.h b/src/include/sdk.h
index 7e773d0..d528689 100644
--- a/src/include/sdk.h
+++ b/src/include/sdk.h
@@ -21,6 +21,12 @@
 /* triangleapi_s */
 #include "sdk/common/triangleapi.h"
 
+/* mstudioanim_t, mstudioseqdesc_t, mstudiobone_t, etc. */
+#include "sdk/engine/studio.h"
+
+/* model_t, vec4_t */
+#include "sdk/common/com_model.h"
+
 /*
  * Credits:
  *   https://github.com/UnkwUsr/hlhax/blob/26491984996c8389efec977ed940c5a67a0ecca4/src/sdk.h#L45
@@ -101,4 +107,186 @@ typedef struct cl_clientfuncs_s {
     void (*CLIENTFACTORY)(void);
 } cl_clientfunc_t;
 
+/*
+ * Credits:
+ *   https://github.com/UnkwUsr/hlhax/blob/26491984996c8389efec977ed940c5a67a0ecca4/src/sdk.h#L93
+ */
+typedef struct StudioModelRenderer_s {
+    /* Construction/Destruction */
+    void (*CStudioModelRenderer)(void* this_ptr);
+    void (*_CStudioModelRenderer)(void* this_ptr);
+
+    /* Initialization */
+    void (*Init)(void* this_ptr);
+
+    /* Public Interfaces */
+    int (*StudioDrawModel)(void* this_ptr, int flags);
+    int (*StudioDrawPlayer)(void* this_ptr, int flags,
+                            struct entity_state_s* pplayer);
+
+    /* ----- Local interfaces ----- */
+
+    /* Look up animation data for sequence */
+    /* P.S. in other bases i know this have wrong return type: mstudioanim_t
+     * instead mstudioanim_t* :DD */
+    mstudioanim_t* (*StudioGetAnim)(void* this_ptr, model_t* m_pSubModel,
+                                    mstudioseqdesc_t* pseqdesc);
+
+    /* Interpolate model position and angles and set up matrices */
+    void (*StudioSetUpTransform)(void* this_ptr, int trivial_accept);
+
+    /* Set up model bone positions */
+    void (*StudioSetupBones)(void* this_ptr);
+
+    /* Find final attachment points */
+    void (*StudioCalcAttachments)(void* this_ptr);
+
+    /* Save bone matrices and names */
+    void (*StudioSaveBones)(void* this_ptr);
+
+    /* Merge cached bones with current bones for model */
+    void (*StudioMergeBones)(void* this_ptr, model_t* m_pSubModel);
+
+    /* Determine interpolation fraction */
+    float (*StudioEstimateInterpolant)(void* this_ptr);
+
+    /* Determine current frame for rendering */
+    float (*StudioEstimateFrame)(void* this_ptr, mstudioseqdesc_t* pseqdesc);
+
+    /* Apply special effects to transform matrix */
+    void (*StudioFxTransform)(void* this_ptr, cl_entity_t* ent,
+                              float transform[3][4]);
+
+    /* Spherical interpolation of bones */
+    void (*StudioSlerpBones)(void* this_ptr, vec4_t q1[], float pos1[][3],
+                             vec4_t q2[], float pos2[][3], float s);
+
+    /* Compute bone adjustments ( bone controllers ) */
+    void (*StudioCalcBoneAdj)(void* this_ptr, float dadt, float* adj,
+                              const byte* pcontroller1,
+                              const byte* pcontroller2, byte mouthopen);
+
+    /* Get bone quaternions */
+    void (*StudioCalcBoneQuaterion)(void* this_ptr, int frame, float s,
+                                    mstudiobone_t* pbone, mstudioanim_t* panim,
+                                    float* adj, float* q);
+
+    /* Get bone positions */
+    void (*StudioCalcBonePosition)(void* this_ptr, int frame, float s,
+                                   mstudiobone_t* pbone, mstudioanim_t* panim,
+                                   float* adj, float* pos);
+
+    /* Compute rotations */
+    void (*StudioCalcRotations)(void* this_ptr, float pos[][3], vec4_t* q,
+                                mstudioseqdesc_t* pseqdesc,
+                                mstudioanim_t* panim, float f);
+
+    /* Send bones and verts to renderer */
+    void (*StudioRenderModel)(void* this_ptr);
+
+    /* Finalize rendering */
+    void (*StudioRenderFinal)(void* this_ptr);
+
+    /* GL&D3D vs. Software renderer finishing functions */
+    void (*StudioRenderFinal_Software)(void* this_ptr);
+    void (*StudioRenderFinal_Hardware)(void* this_ptr);
+
+    /* Player specific data */
+    /* Determine pitch and blending amounts for players */
+    void (*StudioPlayerBlend)(void* this_ptr, mstudioseqdesc_t* pseqdesc,
+                              int* pBlend, float* pPitch);
+
+    /* Estimate gait frame for player */
+    void (*StudioEstimateGait)(void* this_ptr, entity_state_t* pplayer);
+
+    /* Process movement of player */
+    void (*StudioProcessGait)(void* this_ptr, entity_state_t* pplayer);
+
+    /*
+    // Client clock
+    double m_clTime;
+    // Old Client clock
+    double m_clOldTime;
+
+    // Do interpolation?
+    int m_fDoInterp;
+    // Do gait estimation?
+    int m_fGaitEstimation;
+
+    // Current render frame #
+    int m_nFrameCount;
+
+    // Cvars that studio model code needs to reference
+    // Use high quality models?
+    cvar_t* m_pCvarHiModels;
+    // Developer debug output desired?
+    cvar_t* m_pCvarDeveloper;
+    // Draw entities bone hit boxes, etc?
+    cvar_t* m_pCvarDrawEntities;
+
+    // The entity which we are currently rendering.
+    cl_entity_t* m_pCurrentEntity;
+
+    // The model for the entity being rendered
+    model_t* m_pRenderModel;
+
+    // Player info for current player, if drawing a player
+    player_info_t* m_pPlayerInfo;
+
+    // The index of the player being drawn
+    int m_nPlayerIndex;
+
+    // The player's gait movement
+    float m_flGaitMovement;
+
+    // Pointer to header block for studio model data
+    studiohdr_t* m_pStudioHeader;
+
+    // Pointers to current body part and submodel
+    mstudiobodyparts_t* m_pBodyPart;
+    mstudiomodel_t* m_pSubModel;
+
+    // Palette substition for top and bottom of model
+    int m_nTopColor;
+    int m_nBottomColor;
+
+    //
+    // Sprite model used for drawing studio model chrome
+    model_t* m_pChromeSprite;
+
+    // Caching
+    // Number of bones in bone cache
+    int m_nCachedBones;
+    // Names of cached bones
+    char m_nCachedBoneNames[MAXSTUDIOBONES][32];
+    // Cached bone & light transformation matrices
+    float m_rgCachedBoneTransform[MAXSTUDIOBONES][3][4];
+    float m_rgCachedLightTransform[MAXSTUDIOBONES][3][4];
+
+    // Software renderer scale factors
+    float m_fSoftwareXScale, m_fSoftwareYScale;
+
+    // Current view vectors and render origin
+    float m_vUp[3];
+    float m_vRight[3];
+    float m_vNormal[3];
+
+    float m_vRenderOrigin[3];
+
+    // Model render counters ( from engine )
+    int* m_pStudioModelCount;
+    int* m_pModelsDrawn;
+
+    // Matrices
+    // Model to world transformation
+    float (*m_protationmatrix)[3][4];
+    // Model to view transformation
+    float (*m_paliastransform)[3][4];
+
+    // Concatenated bone and light transforms
+    float (*m_pbonetransform)[MAXSTUDIOBONES][3][4];
+    float (*m_plighttransform)[MAXSTUDIOBONES][3][4];
+    */
+} StudioModelRenderer_t;
+
 #endif /* SDK_H_ */