diff --git a/build.sh b/build.sh
index b03ff45..f7323fa 100644
--- a/build.sh
+++ b/build.sh
@@ -4,5 +4,6 @@ make F3DEX3_BrW
 cp build/F3DEX3_BrW/F3DEX3_BrW.code ../../Mods/HackerOoT/data/F3DEX3_BrW.code
 cp build/F3DEX3_BrW/F3DEX3_BrW.data ../../Mods/HackerOoT/data/F3DEX3_BrW.data
 make -C ../../Mods/HackerOoT -j12
-cp ../../Mods/HackerOoT/HackerOoT.z64 /media/`whoami`/SOME2/
+#cp ../../Mods/HackerOoT/HackerOoT.z64 /media/`whoami`/SOME2/
+../../Flashcarts/SummerCart64/sw/deployer/target/debug/sc64deployer upload ../../Mods/HackerOoT/HackerOoT.z64
 printf "\n====\nDone\n====\n"
diff --git a/f3dex3.s b/f3dex3.s
index e513cd2..c757867 100644
--- a/f3dex3.s
+++ b/f3dex3.s
@@ -286,6 +286,18 @@ screenX < screenY * -8*c3 +  2*c7
 where screenX and screenY are in subpixels (e.g. screenX = 100 = 25.0 pixels),
 c0-c3 are shorts representing -1:0.99997,
 and c4-c7 are shorts representing "half pixels" (e.g. c4 = 50 = 25.0 pixels)
+
+For the last equation, one option is to think of kx through kc as in s10.5 mode
+instead, so a value of 0x0020 is 1.0 and they can range from -0x400.00 to
+0x3FF.F8. This choice is because clipZ ranges from 0x0000.0000 at the camera
+plane to 0x03FF.0000 at the maximum distance away. The normal distance Adult
+Link is from the camera is about 0x00B0.0000.
+
+A better option is to develop your plane equation in floating point, e.g.
+clipX[f] * -0.2f + clipY[f] * 0.4f + clipZ[f] * 1.0f + -200.0f >= 0
+then multiply everything by (32768.0f / max(abs(kx), abs(ky), abs(kz), abs(kc)))
+(here 32768.0f / 200.0f = 163.84f)
+clipX[f] * -32.77f + clipY[f] * 65.54f + clipZ[f] * 163.84f + -32768
 */
     .dh 0x0000 // c0
     .dh 0x0000 // c1
@@ -659,7 +671,7 @@ postOvlRA equ $12 // Commonly used locally
 //      vtx write
 // $26: taskDataPtr (global)
 // $27: inputBufferPos (global)
-// $28: unused
+// $28: numPrimsDrawn (global)
 // $29: unused
 // $30: unused
 // $ra: Return address for jal, b*al
@@ -1408,8 +1420,9 @@ vtx_store:
     vmadm   $v20, vPairTPosI, vSTScl[2] // Persp norm
     vmadn   $v21, vSTOfs, vSTOfs[3] // Zero
     cfc2    $12, $vcc // Load screen clipping results
-    vmudn   $v29, vPairTPosF, $v30 // X * X factor, Y * Y factor, Z * Z factor
-    vmadh   $v28, vPairTPosI, $v30 // Clamp result, not vreadacc
+    vmudn   $v29, vPairTPosF, $v30 // X * kx, Y * ky, Z * kz
+    vmadh   $v29, vPairTPosI, $v30 // Int * int
+    vreadacc $v28, ACC_UPPER // Load int * int portion
     vne     $v29, $v31, $v31[3h] // Set VCC to 11101110
     srl     $24, $12, 4            // Shift second vertex screen clipping to first slots
     vmudn   $v26, vPairTPosF, $v31[3] // W * clip ratio for scaled clipping
diff --git a/gbi.h b/gbi.h
index 8a921fe..5600be1 100644
--- a/gbi.h
+++ b/gbi.h
@@ -1087,6 +1087,21 @@ typedef struct {
     int y2;
 } Hilite_t;
 
+typedef struct {
+    short c0;
+    short c1;
+    short c2;
+    short c3;
+    short c4;
+    short c5;
+    short c6;
+    short c7;
+    short kx;
+    short ky;
+    short kz;
+    short kc;
+} OcclusionPlane_t;
+
 typedef union {
     Light_t l;
     long long int force_structure_alignment[2];
@@ -1113,6 +1128,12 @@ typedef union {
     long int force_structure_alignment;
 } Hilite;
 
+typedef union {
+    OcclusionPlane_t o;
+    short c[12];
+    long long int force_structure_alignment[3];
+} OcclusionPlane;
+
 typedef struct {
     Light   l[9];
     Ambient a;
@@ -2971,7 +2992,7 @@ _DW({ \
 
 /*
  * Camera world position for Fresnel. Set this whenever you set the VP matrix,
- * viewport, etc. cam is the name/address of a PlainVtx struct.
+ * viewport, etc. cam is the address of a PlainVtx struct.
  */
 #define gSPCameraWorld(pkt, cam) \
     gDma2p((pkt), G_MOVEMEM, (cam), sizeof(PlainVtx), G_MV_LIGHT, 0)
@@ -2981,7 +3002,7 @@ _DW({ \
 
 /*
  * Reflection/Hiliting Macros.
- * la is the name/address of a LookAt struct.
+ * la is the address of a LookAt struct.
  */
 #define gSPLookAt(pkt, la) \
     gDma2p((pkt), G_MOVEMEM, (la), sizeof(LookAt), G_MV_LIGHT, 8)
@@ -3028,6 +3049,22 @@ _DW({ \
         ((((width)  - 1) * 4) + (hilite)->h.x2) & 0xFFF,    \
         ((((height) - 1) * 4) + (hilite)->h.y2) & 0xFFF)
 
+
+/*
+ * Occlusion plane
+ * 
+ * TODO explain how to calculate the coefficients
+ * 
+ * o is the address of an OcclusionPlane struct
+ */
+#define gSPOcclusionPlane(pkt, o) \
+    gDma2p((pkt), G_MOVEMEM, (o), sizeof(OcclusionPlane), G_MV_LIGHT, \
+        (G_MAX_LIGHTS * 0x10) + 0x18)
+#define gsSPOcclusionPlane(o) \
+    gsDma2p(      G_MOVEMEM, (o), sizeof(OcclusionPlane), G_MV_LIGHT, \
+        (G_MAX_LIGHTS * 0x10) + 0x18)
+
+
 /*
  * FOG macros
  * fm = z multiplier