How to use Stipple shader?

[Dreikblack]

Model just became invisible with it. What am i doing wrong?

#include "UltraEngine.h"

using namespace UltraEngine;

int main(int argc, const char* argv[])
{
    //Get the displays
    auto displays = GetDisplays();

    //Create a window
    auto window = CreateWindow("Ultra Engine", 0, 0, 1280, 720, displays[0], WINDOW_CENTER | WINDOW_TITLEBAR);

    //Create a world
    auto world = CreateWorld();

    //Create a framebuffer
    auto framebuffer = CreateFramebuffer(window);

    //Create a camera
    auto camera = CreateCamera(world);
    camera->SetClearColor(0.125);
    camera->SetPosition(0, 0, -4);

    //Create a light
    auto light = CreateBoxLight(world);
    light->SetRotation(45, 35, 0);
    light->SetRange(-10, 10);
    light->SetColor(2);

    //Create a model
    auto model = CreateBox(world);
    model->SetColor(0, 0, 1, 0.5f);
    auto strippleMaterial = CreateMaterial();
    ChangeDir(AppDir());
    auto strippleShader = LoadShaderFamily("Shaders/Editor/Stipple.fam");
    strippleMaterial->SetShaderFamily(strippleShader);
    model->SetMaterial(strippleMaterial);

    //Main loop
    while (window->Closed() == false and window->KeyDown(KEY_ESCAPE) == false)
    {
        world->Update();
        world->Render(framebuffer);
    }
    return 0;
}

 

[SpiderPig]

I havn't looked at the stipple shader yet but maybe it should be a line mesh?

[Josh]

If you add this inside the shaderfamily structure in the file, it will behave like a standard shader:

"root": "Shaders/PBR.fam"

Note that this shader is not really line stippling, it just discards pixels in a grid pattern.

[Dreikblack]

Thanks! Will try do to so later.

Looks like i was thinking about recently for 3D GUI elements (circle to show range for example) and noticed it in latest Workshop.

[Dreikblack]

How does discard work? Looks like it ignores any mesh, not only mesh with this shader

[SpiderPig]

Discard means the pixel is not being drawn to.  I.e discarded or ignored.  Maybe the shader needs to be applied to the mask section of the shader family as well?

[Dreikblack]

8 minutes ago, SpiderPig said:

Maybe the shader needs to be applied to the mask section of the shader family as well?

Same result. Not sure if i did it right tho
 

{
	"shaderfamily":
	{
		"root": "Shaders/PBR.fam",
		"static":
		{
			"float": {
				"opaque": {
					"default": {
						"base": {
							"vertex": "Shaders/PBR/PBR.vert",
							"fragment": "Shaders/Editor/Stipple.frag"
						}
					}
				},
				"mask": {
					"default": {
						"base": {
							"vertex": "Shaders/PBR/PBR.vert",
							"fragment": "Shaders/Editor/Stipple.frag"
						}
					}
				}
			}
		}
	}
}

 

[SpiderPig]

Hmm I'm not sure then.  Josh will know. 😁

[Dreikblack]

Made it work with strippleMaterial->SetTransparent(true);

[Josh]

You could also use alpha masking, and define a fragment shader in the depth pass settings.

[Josh]

Keep in mind, if you have 45 degree lines they will hit some spots where they appear completely solid, and in some positions they will disappear, because it's a checker pattern.

[Dreikblack]

Yeah, with 3D camera it does not look good, especially while moving. SetLineStipple(LINE_STIPPLE_DASHED) was best when it was working before switching to OpenGL