From 1cb21c5a7575a5e127fa52398c0c56ae24f5ce36 Mon Sep 17 00:00:00 2001
From: Kai O'Reilly <koreilly5297@gmail.com>
Date: Sun, 10 Nov 2024 13:58:42 -0800
Subject: [PATCH 1/2] fix xyz on 32-bit platforms

---
 xyz/io/obj/obj.go | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/xyz/io/obj/obj.go b/xyz/io/obj/obj.go
index 7baf95e30d..a205e07558 100644
--- a/xyz/io/obj/obj.go
+++ b/xyz/io/obj/obj.go
@@ -192,7 +192,7 @@ var defaultMat = &Material{
 // Local constants
 const (
 	blanks   = "\r\n\t "
-	invINDEX = math.MaxUint32
+	invINDEX = math.MaxInt32
 	objType  = "obj"
 	mtlType  = "mtl"
 )
@@ -461,7 +461,7 @@ func makeObject(name string) Object {
 // v <x> <y> <z> [w]
 func (dec *Decoder) parseVertex(fields []string) error {
 	if len(fields) < 3 {
-		return errors.New("Less than 3 vertices in 'v' line")
+		return errors.New("fewer than 3 vertices in 'v' line")
 	}
 	for _, f := range fields[:3] {
 		val, err := strconv.ParseFloat(f, 32)
@@ -477,7 +477,7 @@ func (dec *Decoder) parseVertex(fields []string) error {
 // vn <x> <y> <z>
 func (dec *Decoder) parseNormal(fields []string) error {
 	if len(fields) < 3 {
-		return errors.New("Less than 3 normals in 'vn' line")
+		return errors.New("fewer than 3 normals in 'vn' line")
 	}
 	for _, f := range fields[:3] {
 		val, err := strconv.ParseFloat(f, 32)
@@ -493,7 +493,7 @@ func (dec *Decoder) parseNormal(fields []string) error {
 // vt <u> <v> <w>
 func (dec *Decoder) parseTex(fields []string) error {
 	if len(fields) < 2 {
-		return errors.New("Less than 2 texture coords. in 'vt' line")
+		return errors.New("fewer than 2 texture coords. in 'vt' line")
 	}
 	for _, f := range fields[:2] {
 		val, err := strconv.ParseFloat(f, 32)

From 480e86dbca7fe57106315ffea67a5de565d30644 Mon Sep 17 00:00:00 2001
From: Kai O'Reilly <koreilly5297@gmail.com>
Date: Sun, 10 Nov 2024 14:10:08 -0800
Subject: [PATCH 2/2] xyz readme updates

---
 xyz/README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xyz/README.md b/xyz/README.md
index 07f6c191d0..7a70fa8509 100644
--- a/xyz/README.md
+++ b/xyz/README.md
@@ -1,8 +1,8 @@
 # XYZ
 
-`xyz` is a 3D graphics framework written in Go. It is a separate standalone package that renders to an offscreen Vulkan framebuffer, which can easily be converted into a Go `image.RGBA`.  The [xyzcore](xyzcore) package provides an integration of xyz in Cogent Core, for dynamic and efficient 3D rendering within 2D GUI windows.
+`xyz` is a 3D graphics framework written in Go. It is a separate standalone package that renders to an offscreen WebGPU framebuffer, which can easily be converted into a Go `image.RGBA`.  The [xyzcore](xyzcore) package provides an integration of xyz in Cogent Core, for dynamic and efficient 3D rendering within 2D GUI windows.
 
-`xyz` is built on the [gpu](../gpu) WebGPU framework (specifically the [phong](../gpu/phong]) rendering system, and uses the [tree](../tree) tree structure for the scenegraph.  It currently supports standard Phong-based rendering with different types of lights and materials.  It is designed for scientific and other non-game 3D applications, and lacks almost all of the advanced features one would expect in a modern 3D graphics framework.  Thus, its primary advantage is its simplicity and support for directly programming 3D visualizations in Go, its broad cross-platform support across all major desktop and mobile platforms, and the use of WebGPU which is highly efficient.
+`xyz` is built on the [gpu](../gpu) WebGPU framework (specifically the [phong](../gpu/phong) rendering system, and uses the [tree](../tree) tree structure for the scenegraph.  It currently supports standard Phong-based rendering with different types of lights and materials.  It is designed for scientific and other non-game 3D applications, and lacks some of the advanced features one would expect in a modern 3D graphics framework. Thus, its primary advantage is its simplicity and support for directly programming 3D visualizations in Go, its broad cross-platform support across all major desktop, mobile, and web platforms, and the use of WebGPU which is highly efficient.
 
 * The [physics](physics) sub-package provides a physics engine for simulating 3D virtual worlds, using xyz.