diff --git a/src/hardware/hw_drv.h b/src/hardware/hw_drv.h
index 718774773..3b9b8681c 100644
--- a/src/hardware/hw_drv.h
+++ b/src/hardware/hw_drv.h
@@ -51,7 +51,7 @@ EXPORT void HWRAPI(ClearMipMapCache) (void);
 EXPORT void HWRAPI(SetSpecialState) (hwdspecialstate_t IdState, INT32 Value);
 
 //Hurdler: added for new development
-EXPORT void HWRAPI(DrawModel) (model_t *model, INT32 frameIndex, INT32 duration, INT32 tics, INT32 nextFrameIndex, FTransform *pos, float scale, UINT8 flipped, UINT8 hflipped, FSurfaceInfo *Surface);
+EXPORT void HWRAPI(DrawModel) (model_t *model, INT32 frameIndex, float duration, float tics, INT32 nextFrameIndex, FTransform *pos, float scale, UINT8 flipped, UINT8 hflipped, FSurfaceInfo *Surface);
 EXPORT void HWRAPI(CreateModelVBOs) (model_t *model);
 EXPORT void HWRAPI(SetTransform) (FTransform *ptransform);
 EXPORT INT32 HWRAPI(GetTextureUsed) (void);
diff --git a/src/hardware/hw_md2.c b/src/hardware/hw_md2.c
index 67bed7ee3..ade5ce3cb 100644
--- a/src/hardware/hw_md2.c
+++ b/src/hardware/hw_md2.c
@@ -1331,8 +1331,8 @@ boolean HWR_DrawModel(gl_vissprite_t *spr)
 	{
 		patch_t *gpatch, *blendgpatch;
 		GLPatch_t *hwrPatch = NULL, *hwrBlendPatch = NULL;
-		INT32 durs = spr->mobj->state->tics;
-		INT32 tics = spr->mobj->tics;
+		float durs = (float)spr->mobj->state->tics;
+		float tics = (float)spr->mobj->tics;
 		const boolean papersprite = (R_ThingIsPaperSprite(spr->mobj) && !R_ThingIsFloorSprite(spr->mobj));
 		const UINT8 flip = (UINT8)(!(spr->mobj->eflags & MFE_VERTICALFLIP) != !R_ThingVerticallyFlipped(spr->mobj));
 		const UINT8 hflip = (UINT8)(!(spr->mobj->mirrored) != !R_ThingHorizontallyFlipped(spr->mobj));
@@ -1501,8 +1501,8 @@ boolean HWR_DrawModel(gl_vissprite_t *spr)
 		if (spr->mobj->frame & FF_ANIMATE)
 		{
 			// set duration and tics to be the correct values for FF_ANIMATE states
-			durs = spr->mobj->state->var2;
-			tics = spr->mobj->anim_duration;
+			durs = (float)spr->mobj->state->var2;
+			tics = (float)spr->mobj->anim_duration;
 		}
 
 		frame = (spr->mobj->frame & FF_FRAMEMASK);
@@ -1526,7 +1526,11 @@ boolean HWR_DrawModel(gl_vissprite_t *spr)
 		}
 
 #ifdef USE_MODEL_NEXTFRAME
-#define INTERPOLERATION_LIMIT TICRATE/4
+		// Interpolate the model interpolation. (lol)
+		tics -= FixedToFloat(rendertimefrac);
+
+#define INTERPOLERATION_LIMIT (TICRATE * 0.25f)
+
 		if (cv_glmodelinterpolation.value && tics <= durs && tics <= INTERPOLERATION_LIMIT)
 		{
 			if (durs > INTERPOLERATION_LIMIT)
diff --git a/src/hardware/r_opengl/r_opengl.c b/src/hardware/r_opengl/r_opengl.c
index 7ec7ee270..a58097c91 100644
--- a/src/hardware/r_opengl/r_opengl.c
+++ b/src/hardware/r_opengl/r_opengl.c
@@ -2672,7 +2672,7 @@ EXPORT void HWRAPI(CreateModelVBOs) (model_t *model)
 
 #define BUFFER_OFFSET(i) ((void*)(i))
 
-static void DrawModelEx(model_t *model, INT32 frameIndex, INT32 duration, INT32 tics, INT32 nextFrameIndex, FTransform *pos, float scale, UINT8 flipped, UINT8 hflipped, FSurfaceInfo *Surface)
+static void DrawModelEx(model_t *model, INT32 frameIndex, float duration, float tics, INT32 nextFrameIndex, FTransform *pos, float scale, UINT8 flipped, UINT8 hflipped, FSurfaceInfo *Surface)
 {
 	static GLRGBAFloat poly = {0,0,0,0};
 	static GLRGBAFloat tint = {0,0,0,0};
@@ -2701,11 +2701,11 @@ static void DrawModelEx(model_t *model, INT32 frameIndex, INT32 duration, INT32
 	scaley = scale;
 	scalez = scale;
 
-	if (duration != 0 && duration != -1 && tics != -1) // don't interpolate if instantaneous or infinite in length
+	if (duration > 0.0 && tics >= 0.0) // don't interpolate if instantaneous or infinite in length
 	{
-		UINT32 newtime = (duration - tics); // + 1;
+		float newtime = (duration - tics); // + 1;
 
-		pol = (newtime)/(float)duration;
+		pol = newtime / duration;
 
 		if (pol > 1.0f)
 			pol = 1.0f;
@@ -2977,7 +2977,7 @@ static void DrawModelEx(model_t *model, INT32 frameIndex, INT32 duration, INT32
 // -----------------+
 // HWRAPI DrawModel : Draw a model
 // -----------------+
-EXPORT void HWRAPI(DrawModel) (model_t *model, INT32 frameIndex, INT32 duration, INT32 tics, INT32 nextFrameIndex, FTransform *pos, float scale, UINT8 flipped, UINT8 hflipped, FSurfaceInfo *Surface)
+EXPORT void HWRAPI(DrawModel) (model_t *model, INT32 frameIndex, float duration, float tics, INT32 nextFrameIndex, FTransform *pos, float scale, UINT8 flipped, UINT8 hflipped, FSurfaceInfo *Surface)
 {
 	DrawModelEx(model, frameIndex, duration, tics, nextFrameIndex, pos, scale, flipped, hflipped, Surface);
 }