Question

I have a problem with directx 11 rendering – if i try to render more then one model, i see just models with odd index. All model that are rendered with even index are not visible.

my code based on rastertek tutorials:

m_dx->BeginScene(0.0f, 0.0f, 0.0f, 1.0f);
{
    m_camera->Render();

    XMMATRIX view;
    m_camera->GetViewMatrix(view);

    XMMATRIX world;
    m_dx->GetWorldMatrix(world);

    XMMATRIX projection;
    m_dx->GetProjectionMatrix(projection);

    XMMATRIX ortho;
    m_dx->GetOrthoMatrix(ortho);

    world = XMMatrixTranslation(-2, 0, -4);
    m_model->Render(m_dx->GetDeviceContext());
    m_texture_shader->Render(m_dx->GetDeviceContext(), m_model->GetIndicesCount(), world, view, projection,
        m_model->GetTexture());

    world = XMMatrixTranslation(2, 0, -2);
    m_model->Render(m_dx->GetDeviceContext());
    m_texture_shader->Render(m_dx->GetDeviceContext(), m_model->GetIndicesCount(), world, view, projection,
        m_model->GetTexture());

    world = XMMatrixTranslation(0, 0, -3);
    m_model->Render(m_dx->GetDeviceContext());
    m_texture_shader->Render(m_dx->GetDeviceContext(), m_model->GetIndicesCount(), world, view, projection,
        m_model->GetTexture());

}
m_dx->EndScene();

Model render method

UINT stride, offset;

stride = sizeof(VertexPosTextureNormal);
offset = 0;

device_context->IASetVertexBuffers(0, 1, &m_vertex_buffer, &stride, &offset);
device_context->IASetIndexBuffer(m_index_buffer, DXGI_FORMAT_R32_UINT, 0);
device_context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);

Shader render method:

world = XMMatrixTranspose(world);
view = XMMatrixTranspose(view);
projection = XMMatrixTranspose(projection);

D3D11_MAPPED_SUBRESOURCE mapped_subres;
RETURN_FALSE_IF_FAILED(context->Map(m_matrix_buffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mapped_subres));
MatrixBuffer* data = (MatrixBuffer*)mapped_subres.pData;
data->world = world;
data->view = view;
data->projection = projection;
context->Unmap(m_matrix_buffer, 0);
context->VSSetConstantBuffers(0, 1, &m_matrix_buffer);
context->PSSetShaderResources(0, 1, &texture);

    // render
    context->IASetInputLayout(m_layout);

context->VSSetShader(m_vertex_shader, NULL, 0);
context->PSSetShader(m_pixel_shader, NULL, 0);
context->PSSetSamplers(0, 1, &m_sampler_state);
context->DrawIndexed(indices, 0, 0);

What can be the reason of this?

thank you.

Answer 1

This code –

world = XMMatrixTranspose(world);
view = XMMatrixTranspose(view);
projection = XMMatrixTranspose(projection); 

is transposing the same matrixes each time you call it so they only have the correct value alternate times. The world matrix is being reset each time in the calling code but the view and project matrices are wrong alternate times.