update README

soypat · Aug 25, 2024 · d078123 · d078123
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diff --git a/README.md b/README.md
@@ -2,8 +2,7 @@
 Offshoot from [this project](https://github.com/soypat/sdf/pull/13). 
 
 ![circle](https://github.com/user-attachments/assets/91c99f47-0c52-4cb1-83e7-452b03b69dff)
-![iso-screw](https://github.com/user-attachments/assets/6bc987b9-d522-42a4-89df-71a20c3ae7ff)
-
+![bolt-example](https://github.com/user-attachments/assets/8da50871-2415-423f-beb3-0d78ad67c79e)
 
 
 ## Features
@@ -92,7 +91,18 @@ Below is the 3D scene code. Omits rendering pipeline.
 	union = gsdf.Difference(union, hole)
 	// Convert from imperial inches units to millimeter:
 	union = gsdf.Scale(union, 25.4)
-	renderSDF(union)
+
+	stl, _ := os.Create("for3dprinting.stl")
+	err = gsdfaux.Render(object, gsdfaux.RenderConfig{
+		STLOutput:    stl,
+		Resolution:   union.Bounds().Diagonal() / 200,
+		UseGPU:       true,
+	})
 ```
 
+![npt-flange-example](https://github.com/user-attachments/assets/32a00926-0a1e-47f0-8b6c-dda940240265)
+
+## More examples
+![fibonacci-showerhead](https://github.com/user-attachments/assets/a72c366c-6ee0-43ba-9128-087a76524ff9)
+![iso-screw](https://github.com/user-attachments/assets/6bc987b9-d522-42a4-89df-71a20c3ae7ff)
 ![array-triangles](https://github.com/user-attachments/assets/6a479889-2836-464c-b8ea-82109a5aad13)
diff --git a/examples/bolt/main.go b/examples/bolt/main.go
@@ -4,9 +4,12 @@ import (
 	"flag"
 	"fmt"
 	"log"
+	"math"
 	"os"
 	"runtime"
 
+	"github.com/soypat/glgl/math/ms3"
+	"github.com/soypat/gsdf"
 	"github.com/soypat/gsdf/forge/threads"
 	"github.com/soypat/gsdf/glbuild"
 	"github.com/soypat/gsdf/gsdfaux"
@@ -21,7 +24,7 @@ func init() {
 
 // scene generates the 3D object for rendering.
 func scene() (glbuild.Shader3D, error) {
-	const L, shank = 5, 3
+	const L, shank = 8, 3
 	threader := threads.ISO{D: 3, P: 0.5, Ext: true}
 	M3, err := threads.Bolt(threads.BoltParams{
 		Thread:      threader,
@@ -32,6 +35,7 @@ func scene() (glbuild.Shader3D, error) {
 	if err != nil {
 		return nil, err
 	}
+	M3, _ = gsdf.Rotate(M3, math.Pi/2, ms3.Vec{Y: 1})
 	return M3, nil
 }
 

diff --git a/gsdfaux/gsdfaux.go b/gsdfaux/gsdfaux.go
@@ -10,6 +10,7 @@ import (
 	"time"
 
 	math "github.com/chewxy/math32"
+	"github.com/soypat/glgl/math/ms3"
 	"github.com/soypat/gsdf"
 	"github.com/soypat/gsdf/glbuild"
 	"github.com/soypat/gsdf/gleval"
@@ -76,17 +77,18 @@ func Render(s glbuild.Shader3D, cfg RenderConfig) (err error) {
 
 	if cfg.VisualOutput != nil {
 		watch = stopwatch()
-		const sceneSize = 0.5
+		const sceneSize = 1.4
 		// We include the bounding box in the visualization.
 		bb := s.Bounds()
-		envelope, err := gsdf.NewBoundsBoxFrame(bb)
+		envelope, err := gsdf.NewBoundsBoxFrame(bb.Add(ms3.Vec{100, 100, 100}))
 		if err != nil {
 			return err
 		}
 		visual := gsdf.Union(s, envelope)
 		// Scale size and translate to center so visualization is in camera range.
 		center := bb.Center()
-		visual = gsdf.Translate(visual, center.X, center.Y, center.Z)
+		sz := bb.Size()
+		visual = gsdf.Translate(visual, center.X, center.Y, center.Z-sz.Z)
 		visual = gsdf.Scale(visual, sceneSize/bb.Diagonal())
 		_, err = glbuild.NewDefaultProgrammer().WriteFragVisualizerSDF3(cfg.VisualOutput, visual)
 		if err != nil {