[enhancement] Collision Viewer (#59)

* Update render_courses.c

* Update render_courses.c

* Update ImguiUI.cpp

* Create collision_viewer.c

* Update render_courses.c

* Update render_courses.c

* Create collision_viewer.h

* Update collision_viewer.c

* Update render_courses.c

* Update render_courses.c

4 files changed, 313 insertions, 3 deletions

diff --git a/src/enhancements/collision_viewer.c b/src/enhancements/collision_viewer.c
new file mode 100644
index 000000000..d66fa2998
--- /dev/null
+++ b/src/enhancements/collision_viewer.c
@@ -0,0 +1,288 @@
+#include <libultraship.h>
+#include "mk64.h"
+
+//! @todo decide to use colours or textures and fix displaylists because they are buggy
+
+void render_collision(void) {
+    Mat4 matrix;
+    gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_OFF);
+    gSPSetGeometryMode(gDisplayListHead++, G_ZBUFFER | G_SHADE | G_SHADING_SMOOTH);
+    gSPClearGeometryMode(gDisplayListHead++, G_CULL_BACK);
+    gDPPipeSync(gDisplayListHead++);
+    gDPSetOtherMode(gDisplayListHead++, G_AD_NOTPATTERN | G_CD_MAGICSQ | G_CK_NONE | G_TC_FILT | G_TF_BILERP | G_TT_NONE | G_TL_TILE | G_TD_CLAMP | G_TP_PERSP | G_CYC_1CYCLE | G_PM_NPRIMITIVE, G_AC_NONE | G_ZS_PIXEL | G_RM_AA_ZB_OPA_SURF | G_RM_AA_ZB_OPA_SURF2);
+    gDPSetCombineMode(gDisplayListHead++, G_CC_SHADE, G_CC_SHADE);
+
+    // Set matrix
+    gSPMatrix(gDisplayListHead++, &gIdentityMtx2, G_MTX_MODELVIEW | G_MTX_LOAD | G_MTX_NOPUSH);
+
+    for (size_t i = 0; i < gCollisionMeshCount; i++) {
+        // Load vertices for this tri
+
+        switch(gCollisionMesh[i].surfaceType) {
+            case ASPHALT:
+
+            //     gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+            //     gDPTileSync(gDisplayListHead++);
+            //    gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_MIRROR | G_TX_WRAP, 6, G_TX_NOLOD);
+            //     gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x00FC, 0x007C);
+            //     gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTextureRoad1);
+            //     gDPTileSync(gDisplayListHead++);
+            //     gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+            //     gDPLoadSync(gDisplayListHead++);
+            //     gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 2047, 128);
+            //     gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+            //     gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                gCollisionMesh[i].vtx1->v.cn[0] = 50;
+                gCollisionMesh[i].vtx1->v.cn[1] = 50;
+                gCollisionMesh[i].vtx1->v.cn[2] = 50;
+                gCollisionMesh[i].vtx2->v.cn[0] = 50;
+                gCollisionMesh[i].vtx2->v.cn[1] = 50;
+                gCollisionMesh[i].vtx2->v.cn[2] = 50;
+                gCollisionMesh[i].vtx3->v.cn[0] = 50;
+                gCollisionMesh[i].vtx3->v.cn[1] = 50;
+                gCollisionMesh[i].vtx3->v.cn[2] = 50;
+                
+                break;
+            case DIRT: // gTexture64619C
+                gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x007C);
+                gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTexture64AF50);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                gDPLoadSync(gDisplayListHead++);
+                gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                // gCollisionMesh[i].vtx1->v.cn[0] = 255;
+                // gCollisionMesh[i].vtx1->v.cn[1] = 248;
+                // gCollisionMesh[i].vtx1->v.cn[2] = 220;
+                // gCollisionMesh[i].vtx2->v.cn[0] = 255;
+                // gCollisionMesh[i].vtx2->v.cn[1] = 248;
+                // gCollisionMesh[i].vtx2->v.cn[2] = 220;
+                // gCollisionMesh[i].vtx3->v.cn[0] = 255;
+                // gCollisionMesh[i].vtx3->v.cn[1] = 248;
+                // gCollisionMesh[i].vtx3->v.cn[2] = 220;
+                break;
+            case SAND:
+                // gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                // gDPTileSync(gDisplayListHead++);
+                // gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                // gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x007C);
+                // gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTexture67BEE8);
+                // gDPTileSync(gDisplayListHead++);
+                // gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                // gDPLoadSync(gDisplayListHead++);
+                // gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                // gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                // gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                // gCollisionMesh[i].vtx1->v.cn[0] = 255;
+                // gCollisionMesh[i].vtx1->v.cn[1] = 121;
+                // gCollisionMesh[i].vtx1->v.cn[2] = 25;
+                // gCollisionMesh[i].vtx2->v.cn[0] = 255;
+                // gCollisionMesh[i].vtx2->v.cn[1] = 121;
+                // gCollisionMesh[i].vtx2->v.cn[2] = 25;
+                // gCollisionMesh[i].vtx3->v.cn[0] = 255;
+                // gCollisionMesh[i].vtx3->v.cn[1] = 121;
+                // gCollisionMesh[i].vtx3->v.cn[2] = 25;
+                break;
+            case STONE:
+                gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x007C);
+                gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTexture6528DC);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                gDPLoadSync(gDisplayListHead++);
+                gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                // gCollisionMesh[i].vtx1->v.cn[0] = 128;
+                // gCollisionMesh[i].vtx1->v.cn[1] = 128;
+                // gCollisionMesh[i].vtx1->v.cn[2] = 128;
+                // gCollisionMesh[i].vtx2->v.cn[0] = 128;
+                // gCollisionMesh[i].vtx2->v.cn[1] = 128;
+                // gCollisionMesh[i].vtx2->v.cn[2] = 128;
+                // gCollisionMesh[i].vtx3->v.cn[0] = 128;
+                // gCollisionMesh[i].vtx3->v.cn[1] = 128;
+                // gCollisionMesh[i].vtx3->v.cn[2] = 128;
+                break;
+            case SNOW:
+                gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x007C);
+                gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTexture677F04);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                gDPLoadSync(gDisplayListHead++);
+                gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                break;
+            case SAND_OFFROAD:
+                gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x007C);
+                gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTexture67B9B0);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                gDPLoadSync(gDisplayListHead++);
+                gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                break;
+            case GRASS: // gTextureGrass1
+
+                gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x007C);
+                gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTextureGrass1);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                gDPLoadSync(gDisplayListHead++);
+                gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+
+
+                // gCollisionMesh[i].vtx1->v.cn[0] = 50;
+                // gCollisionMesh[i].vtx1->v.cn[1] = 180;
+                // gCollisionMesh[i].vtx1->v.cn[2] = 50;
+                // gCollisionMesh[i].vtx2->v.cn[0] = 50;
+                // gCollisionMesh[i].vtx2->v.cn[1] = 180;
+                // gCollisionMesh[i].vtx2->v.cn[2] = 50;
+                // gCollisionMesh[i].vtx3->v.cn[0] = 50;
+                // gCollisionMesh[i].vtx3->v.cn[1] = 180;
+                // gCollisionMesh[i].vtx3->v.cn[2] = 50;
+                break;
+            case ICE:
+                gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x007C);
+                gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTexture643B3C);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                gDPLoadSync(gDisplayListHead++);
+                gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                break;
+            case WET_SAND:
+                // gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                // gDPTileSync(gDisplayListHead++);
+                // gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_CLAMP, 6, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                // gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x00FC);
+                // gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTexture66DD38);
+                // gDPTileSync(gDisplayListHead++);
+                // gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                // gDPLoadSync(gDisplayListHead++);
+                // gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                // gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                // gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                break;
+                case SNOW_OFFROAD:
+                    gCollisionMesh[i].vtx1->v.cn[0] = 80;
+                    gCollisionMesh[i].vtx1->v.cn[1] = 80;
+                    gCollisionMesh[i].vtx1->v.cn[2] = 80;
+                    gCollisionMesh[i].vtx2->v.cn[0] = 80;
+                    gCollisionMesh[i].vtx2->v.cn[1] = 80;
+                    gCollisionMesh[i].vtx2->v.cn[2] = 80;
+                    gCollisionMesh[i].vtx3->v.cn[0] = 80;
+                    gCollisionMesh[i].vtx3->v.cn[1] = 80;
+                    gCollisionMesh[i].vtx3->v.cn[2] = 80;
+                    break;
+                case CLIFF:
+                    break;
+                case DIRT_OFFROAD:
+                    break;
+                case TRAIN_TRACK: // gTextureRailroadTrack
+                    gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                    gDPTileSync(gDisplayListHead++);
+                    gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 16, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 6, G_TX_NOLOD);
+                    gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x00FC, 0x007C);
+                    gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTextureRailroadTrack);
+                    gDPTileSync(gDisplayListHead++);
+                    gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                    gDPLoadSync(gDisplayListHead++);
+                    gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 2047, 128);
+                    gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                    gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                    break;
+                case CAVE:
+                    break;
+            case OUT_OF_BOUNDS:
+                gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x007C);
+                gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTexture64313C);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                gDPLoadSync(gDisplayListHead++);
+                gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                // gCollisionMesh[i].vtx1->v.cn[0] = 255;
+                // gCollisionMesh[i].vtx1->v.cn[1] = 0;
+                // gCollisionMesh[i].vtx1->v.cn[2] = 0;
+                // gCollisionMesh[i].vtx2->v.cn[0] = 255;
+                // gCollisionMesh[i].vtx2->v.cn[1] = 0;
+                // gCollisionMesh[i].vtx2->v.cn[2] = 0;
+                // gCollisionMesh[i].vtx3->v.cn[0] = 255;
+                // gCollisionMesh[i].vtx3->v.cn[1] = 0;
+                // gCollisionMesh[i].vtx3->v.cn[2] = 0;
+                break;
+            case BOOST_RAMP_WOOD:
+            case BOOST_RAMP_ASPHALT:
+            case RAMP:
+                gCollisionMesh[i].vtx1->v.cn[0] = 255;
+                gCollisionMesh[i].vtx1->v.cn[1] = 255;
+                gCollisionMesh[i].vtx1->v.cn[2] = 0;
+                gCollisionMesh[i].vtx2->v.cn[0] = 255;
+                gCollisionMesh[i].vtx2->v.cn[1] = 255;
+                gCollisionMesh[i].vtx2->v.cn[2] = 0;
+                gCollisionMesh[i].vtx3->v.cn[0] = 255;
+                gCollisionMesh[i].vtx3->v.cn[1] = 255;
+                gCollisionMesh[i].vtx3->v.cn[2] = 0;
+                break;
+            case WOOD_BRIDGE:
+            case ROPE_BRIDGE:
+            case BRIDGE:
+                gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_ON);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 8, 0x0000, G_TX_RENDERTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, 5, G_TX_NOLOD);
+                gDPSetTileSize(gDisplayListHead++, G_TX_RENDERTILE, 0, 0, 0x007C, 0x007C);
+                gDPSetTextureImage(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 1, gTexture676FB0);
+                gDPTileSync(gDisplayListHead++);
+                gDPSetTile(gDisplayListHead++, G_IM_FMT_RGBA, G_IM_SIZ_16b, 0, 0x0000, G_TX_LOADTILE, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOLOD);
+                gDPLoadSync(gDisplayListHead++);
+                gDPLoadBlock(gDisplayListHead++, G_TX_LOADTILE, 0, 0, 1023, 256);
+                gDPSetCombineMode(gDisplayListHead++, G_CC_MODULATEIA, G_CC_MODULATEIA);
+                gDPSetRenderMode(gDisplayListHead++, G_RM_AA_ZB_XLU_INTER, G_RM_NOOP2);
+                // gCollisionMesh[i].vtx1->v.cn[0] = 0;
+                // gCollisionMesh[i].vtx1->v.cn[1] = 255;
+                // gCollisionMesh[i].vtx1->v.cn[2] = 0;
+                // gCollisionMesh[i].vtx2->v.cn[0] = 0;
+                // gCollisionMesh[i].vtx2->v.cn[1] = 255;
+                // gCollisionMesh[i].vtx2->v.cn[2] = 0;
+                // gCollisionMesh[i].vtx3->v.cn[0] = 0;
+                // gCollisionMesh[i].vtx3->v.cn[1] = 255;
+                // gCollisionMesh[i].vtx3->v.cn[2] = 0;
+                break;
+        }
+
+        gSPVertex(gDisplayListHead++, gCollisionMesh[i].vtx1, 1, 0);
+        gSPVertex(gDisplayListHead++, gCollisionMesh[i].vtx2, 1, 1);
+        gSPVertex(gDisplayListHead++, gCollisionMesh[i].vtx3, 1, 2);
+
+        // Draw tri
+        gSP1Triangle(gDisplayListHead++, 0, 1, 2, 0);
+        gSPTexture(gDisplayListHead++, 0xFFFF, 0xFFFF, 0, G_TX_RENDERTILE, G_OFF);
+    }
+ }
diff --git a/src/enhancements/collision_viewer.h b/src/enhancements/collision_viewer.h
new file mode 100644
index 000000000..8a2a3ab74
--- /dev/null
+++ b/src/enhancements/collision_viewer.h
@@ -0,0 +1,9 @@
+#ifndef COLLISION_VIEWER_H
+#define COLLISION_VIEWER_H
+
+#include <libultraship.h>
+
+void render_collision(void);
+
+
+#endif // COLLISION_VIEWER_H
diff --git a/src/port/ui/ImguiUI.cpp b/src/port/ui/ImguiUI.cpp
index 69d3d82e9..d434de37a 100644
--- a/src/port/ui/ImguiUI.cpp
+++ b/src/port/ui/ImguiUI.cpp
@@ -494,7 +494,9 @@ void DrawDebugMenu() {
             { .tooltip =
                   "Enables the Gfx Debugger window, allowing you to input commands, type help for some examples" });
 
-        UIWidgets::CVarCheckbox("Debug mode", "gEnableDebugMode", { .tooltip = "TBD" });
+        UIWidgets::CVarCheckbox("Debug mode", "gEnableDebugMode", {
+            .tooltip = "Enable debug mode"
+        });
 
         UIWidgets::CVarCheckbox("Level Selector", "gLevelSelector",
                                 { .tooltip = "Allows you to select any level from the main menu" });
@@ -502,6 +504,10 @@ void DrawDebugMenu() {
         UIWidgets::CVarCheckbox("SFX Jukebox", "gSfxJukebox",
                                 { .tooltip = "Allows you to play sound effects from the game" });
 
+        UIWidgets::CVarCheckbox("Render Collision", "gRenderCollisionMesh", {
+            .tooltip = "Renders the collision mesh instead of the course mesh"
+        });
+
         UIWidgets::Spacer(0);
 
         UIWidgets::WindowButton("GameInfo", "gGameInfoEnabled", GameUI::mGameInfoWindow,
diff --git a/src/racing/render_courses.c b/src/racing/render_courses.c
index e2017cad2..4f0b67c33 100644
--- a/src/racing/render_courses.c
+++ b/src/racing/render_courses.c
@@ -22,6 +22,8 @@
 #include "courses/all_course_offsets.h"
 #include <assert.h>
 
+#include "enhancements/collision_viewer.h"
+
 s16 D_802B87B0 = 995;
 s16 D_802B87B4 = 1000;
 UNUSED s32 D_802B87B8 = 0;
@@ -1368,10 +1370,15 @@ void func_8029569C(void) {
 }
 
 void render_course(struct UnkStruct_800DC5EC *arg0) {
-
     func_802B5D64(D_800DC610, D_802B87D4, 0, 1);
 
-    if ((CVarGetInteger("gFreecam", 0) == 1) ) {
+    // Freecam priority renders collision.
+    if (CVarGetInteger("gRenderCollisionMesh", 0) == true) {
+        render_collision();
+        return;
+    }
+
+    if ((CVarGetInteger("gFreecam", 0) == true) ) {
         // Render credits courses
         func_8029569C();
         return;