"Wrong number of primitive indices"

[Dreikblack]

Happens on mesh->AddPrimitive(1, 2, 4, 3); (54 line)

Trying to remake tetrahedron as a model here.

#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 framebuffer
    auto framebuffer = CreateFramebuffer(window);

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

    //Create a camera    
    auto camera = CreateCamera(world);
    camera->SetClearColor(0.8);
    camera->Turn(35, 0, 0);
    camera->Move(0, 0, -2);

    //Create light
    auto light = CreateBoxLight(world);
    light->SetRange(-20, 20);
    light->SetArea(20, 20);
    light->SetRotation(35, 35, 0);

    auto unlitMaterial = CreateMaterial();
    auto unlitShader = LoadShaderFamily("Shaders/Unlit.json");
    unlitMaterial->SetShaderFamily(unlitShader);

    int width = 4, height = 2, length = 6;
    auto model = CreateModel(world);
    auto mesh = model->AddMesh();

    mesh->AddVertex(0, 0, 0); //S
    mesh->AddVertex(-width * 0.5, -height * 0.5, length);//NW
    mesh->AddVertex(width * 0.5, -height * 0.5, length);//NE

    mesh->AddPrimitive(0, 1, 2);//S , NW, NE

    mesh->AddVertex(-width * 0.5, height * 0.5, length);//NW h
    mesh->AddVertex(width * 0.5, height * 0.5, length);//NE h

    mesh->AddPrimitive(0, 3, 4);//S , NW h, NE h

    mesh->AddPrimitive(0, 1, 3);//left

    mesh->AddPrimitive(1, 2); //"face"
    mesh->AddPrimitive(2, 4); //"face"
    mesh->AddPrimitive(4, 3); //"face"
    mesh->AddPrimitive(1, 3); //"face"


    mesh->AddPrimitive(2, 4, 0); //"right"

    model->SetColor(0.5f, 0.8f, 0, 0.25f);
    auto& mat = unlitMaterial;
    mat->SetTransparent(true);
    model->SetMaterial(mat);
    auto collider = CreateConvexHullCollider(model);
    model->SetCollider(collider);

    auto modelLine = CreateModel(world);
    auto meshLine = modelLine->AddMesh(MESH_LINES);

    meshLine->AddVertex(0, 0, 0); //S
    meshLine->AddVertex(-width * 0.5, -height * 0.5, length);//NW
    meshLine->AddVertex(width * 0.5, -height * 0.5, length);//NE

    meshLine->AddPrimitive(0, 1, 2);//S , NW, NE

    meshLine->AddVertex(-width * 0.5, height * 0.5, length);//NW h
    meshLine->AddVertex(width * 0.5, height * 0.5, length);//NE h

    meshLine->AddPrimitive(0, 3);//S , NW h, NE h
    meshLine->AddPrimitive(3, 4);//S , NW h, NE h
    meshLine->AddPrimitive(0, 4);//S , NW h, NE h


    meshLine->AddPrimitive(0, 1);//left
    meshLine->AddPrimitive(1, 3);//left
    meshLine->AddPrimitive(0, 3);//left

    meshLine->AddPrimitive(1, 2); //"face"
    meshLine->AddPrimitive(2, 4); //"face"
    meshLine->AddPrimitive(4, 3); //"face"
    meshLine->AddPrimitive(1, 3); //"face"

    meshLine->AddPrimitive(2, 4, 0); //"right"

    //Finalize the brush
    modelLine->SetColor(0.5f, 0.8f, 0, 0.25f);
    auto matLine = unlitMaterial;
    matLine->SetLineStipple(LINE_STIPPLE_DASHED);
    modelLine->SetMaterial(matLine);

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

 

[SpiderPig]

For a line mesh AddPrimitive() should only take 2 arguments.  1 vertex for each end of a line.

[Dreikblack]

It was in usual mesh code. Anyway after changing it still keep happening at 53rd line - mesh->AddPrimitive(1, 2);

[Dreikblack]

Tried even set it to MESH_QUADS, but now it crahses at mesh->AddPrimitive(0, 1, 2); Should it really always match each other?

[Dreikblack]

Made it work but i have strange triangle at bottom

#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 framebuffer
    auto framebuffer = CreateFramebuffer(window);

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

    //Create a camera    
    auto camera = CreateCamera(world);
    camera->SetClearColor(0.8);
    camera->Turn(35, 0, 0);
    camera->Move(0, 0, -1);

    //Create light
    auto light = CreateBoxLight(world);
    light->SetRange(-20, 20);
    light->SetArea(20, 20);
    light->SetRotation(35, 35, 0);

    auto unlitMaterial = CreateMaterial();
    auto unlitShader = LoadShaderFamily("Shaders/Unlit.json");
    unlitMaterial->SetShaderFamily(unlitShader);

    int width = 4, height = 2, length = 6;
    auto model = CreateModel(world);
    auto mesh = model->AddMesh();

    mesh->AddVertex(0, 0, 0); //S
    mesh->AddVertex(-width * 0.5, -height * 0.5, length);//NW
    mesh->AddVertex(width * 0.5, -height * 0.5, length);//NE

    mesh->AddPrimitive(0, 1, 2);//S , NW, NE

    mesh->AddVertex(-width * 0.5, height * 0.5, length);//NW h
    mesh->AddVertex(width * 0.5, height * 0.5, length);//NE h

    mesh->AddPrimitive(0, 3, 4);//S , NW h, NE h

    mesh->AddPrimitive(0, 1, 3);//left

    mesh->AddPrimitive(1, 3, 4); //"face"
    mesh->AddPrimitive(1, 4, 2); //"face"


    mesh->AddPrimitive(2, 4, 0); //"right"

    model->SetColor(0.5f, 0.8f, 0, 0.25f);
    auto& mat = unlitMaterial;
    mat->SetTransparent(true);
    model->SetMaterial(mat);
    auto collider = CreateConvexHullCollider(model);
    model->SetCollider(collider);

    auto modelLine = CreateModel(world);
    auto meshLine = modelLine->AddMesh(MESH_LINES);

    meshLine->AddVertex(0, 0, 0); //S
    meshLine->AddVertex(-width * 0.5, -height * 0.5, length);//NW
    meshLine->AddVertex(width * 0.5, -height * 0.5, length);//NE

    meshLine->AddPrimitive(0, 1);//S , NW, NE
    meshLine->AddPrimitive(1, 2);//S , NW, NE
    meshLine->AddPrimitive(0, 2);//S , NW, NE

    meshLine->AddVertex(-width * 0.5, height * 0.5, length);//NW h
    meshLine->AddVertex(width * 0.5, height * 0.5, length);//NE h

    meshLine->AddPrimitive(0, 3);//S , NW h, NE h
    meshLine->AddPrimitive(3, 4);//S , NW h, NE h
    meshLine->AddPrimitive(0, 4);//S , NW h, NE h


    meshLine->AddPrimitive(0, 1);//left
    meshLine->AddPrimitive(1, 3);//left
    meshLine->AddPrimitive(0, 3);//left

    meshLine->AddPrimitive(1, 2); //"face"
    meshLine->AddPrimitive(2, 4); //"face"
    meshLine->AddPrimitive(4, 3); //"face"
    meshLine->AddPrimitive(1, 3); //"face"

    meshLine->AddPrimitive(2, 4); //"right"
    meshLine->AddPrimitive(4, 0); //"right"
    meshLine->AddPrimitive(2, 0); //"right"

    //Finalize the brush
    modelLine->SetColor(0, 0, 0, 1);
    auto matLine = unlitMaterial;
    matLine->SetLineStipple(LINE_STIPPLE_DASHED);
    modelLine->SetMaterial(matLine);

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

 

[Josh]

If you are using transparency, I am thinking the darker surface may just be due to the ordering of the polygons. Maybe if you enable backface culling and make all the faces pointing out, you won't have overlapping polygons.

[Dreikblack]

camera->SetBackfaceCulling(1); does nothing in my case and with 0 argument another triangle also became darker

Brush with same shape worked fine btw without extra culling settings.

[Josh]

When I ran your code I did not see any visible object.

[Dreikblack]

Strange. I even copy-pasted my code from a message two posts above just to mask sure:

[Josh]

Unlit.fam 

[Josh]

I think some of your faces are flipped inwards and if you make them all point outwards you won't get the overlapping faces that cause some areas to be darker.

[Dreikblack]

Just now, Josh said:

Unlit.fam 

I guess something changed in last updates? Was not updating because it could break something again XD

[Dreikblack]

1 minute ago, Josh said:

faces are flipped inwards and if you make them all point outward

How to point them in other direction?

[Josh]

Add the indices in the reverse order.

[Dreikblack]

Makes sense