Transparent object changes colors when camera changes the angle

Grasshopper ShapeDiver
1

In the scene, I have translucent objects which are set to 20% occupancy in black color.
After I embedded the SD model to our website, the color looks not black, but white-ish.
And when I rotate the camera to different angles, the objects can be presented as black translucent again.
I was wondering the reasons for this.
Is it related to lighting? Or the material?

In the model, the lady and cat should be in black color.

transparent (3)
transparent (3)800×748 39.8 KB

But it is showing in grey-ish color. And sometimes, for both of them, sometimes just one of them, based on the angle of camera.
transparent (2)
transparent (2)830×778 37 KB

transparent (1)
transparent (1)751×694 40.5 KB

transparent (4)
transparent (4)803×699 39.9 KB

2

I looked at your model and could not reproduce this issue. Which device and browser are you using? Did you test using other devices and/or browsers?

3

@mathieu1 Thanks for your reply.
I tested on multiple devices, with different desktops, laptops, with different browsers, Chrom, Firefox, Microsoft Edge. So far alll of them have the exact same issue.

4

Please send me a link to the specific model, I must have looked at another one.

5

This issue happens in the version 2 of the viewer and is a known issue with the way this version deals with transparency. It is fixed in version 3 of the viewer.