# G4P ViewListener imported obj render problem
**URL:** https://discourse.processing.org/t/g4p-viewlistener-imported-obj-render-problem/13794
**Category:** Libraries
**Created:** [September 4, 2019, 10:12am UTC](https://discourse.processing.org/t/g4p-viewlistener-imported-obj-render-problem/13794 "2019-09-04T10:12:01Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@mala](https://discourse.processing.org/u/mala)
#### Post date: [September 4, 2019, 10:12am UTC](https://discourse.processing.org/t/g4p-viewlistener-imported-obj-render-problem/13794/1 "2019-09-04T10:12:02Z")
I’m getting a strange effect when trying to render stroke & fill on an imported obj, the stroke appears to only be rendered once at first frame , almost as an orthographic projection, this stroke rotates with the box as expected but is flat.
As a simple example, take the G4P\_ViewListeners example file, import a simple .obj and set up some shading:
```auto
PShape box;
void settings() {
size(600, 380, P2D);
}
void setup() {
box = loadShape("data/"+"box.obj");
box.setStroke(true);
box.setStroke(color(42, 100, 138));
box.setStrokeWeight(2.0f);
box.setFill(color(50, 50, 50));
```
and replace the box(80) in the “ShowBox” tab with the pshape:
```auto
v.beginDraw();
//v.ambientLight(100, 100, 10);
//v.directionalLight(255, 255, 0, 0.5f, 1, -2f);
v.background(0);
v.translate(v.width/2, v.height/2);
v.rotateX(0.19f * a);
v.rotateY(1.101f * a);
v.rotateZ(1.357f * a);
//v.fill(255, 200, 128);
//v.stroke(255, 0, 0);
//v.strokeWeight(4);
v.shape(box);
//v.box(80);
a += delta;
v.endDraw();
```
Could be this is not a problem with G4P as such but inherited from PGraphics… though I’ve been able to render stroke and fill on an imported obj when not using G4P.
Has anyone any ideas?
---
### Author:  [@quark](https://discourse.processing.org/u/quark)
#### Post date: [September 4, 2019, 10:50am UTC](https://discourse.processing.org/t/g4p-viewlistener-imported-obj-render-problem/13794/2 "2019-09-04T10:50:28Z")
The GView control uses a Processing PGraphic object as a buffer for the display. The buffer is either JAVA2D, P2D or P3D depending on what you passed as parameters when you created the control. So in your code above `v` is a PGraphics3D object.
You might try adding the line
```auto
v.hint(DISABLE_OPTIMIZED_STROKE);
```
after the background statement and see if that helps.
---
### Author:  [@mala](https://discourse.processing.org/u/mala)
#### Post date: [September 4, 2019, 11:12am UTC](https://discourse.processing.org/t/g4p-viewlistener-imported-obj-render-problem/13794/3 "2019-09-04T11:12:45Z")
@quark
thanks for the suggestion, unfortunately that doesn’t seem to have helped ☹
---
### Author:  [@quark](https://discourse.processing.org/u/quark)
#### Post date: [September 4, 2019, 11:29am UTC](https://discourse.processing.org/t/g4p-viewlistener-imported-obj-render-problem/13794/4 "2019-09-04T11:29:58Z")
Have you tried drawing the shape straight onto the screen, bypassing G4P. Any solution should be applied in the listener.
To be honest I don’t think the problem is with G4P because the GView control uses Processing drawing commands with Processing rendering modes.
---
### Author:  [@mala](https://discourse.processing.org/u/mala)
#### Post date: [September 4, 2019, 11:49am UTC](https://discourse.processing.org/t/g4p-viewlistener-imported-obj-render-problem/13794/5 "2019-09-04T11:49:28Z")
Have found the solution, the sketch itself must be P3D in order for the stroke to be rendered correctly i.e :
```auto
void settings() {
size(600, 380, P3D);
}
```
Cheers,
mala