How do I change the triangle in to a square in my d3d11 app (I don't have much experience so idk how to do it) I got the code from this http://www.directxtutorial.com/Lesson.aspx?lessonid=11-4-5 tutorial to render a green triagle but i need to make it a square.
1 Answers
Instead of drawing a single triangle, you draw TWO triangles that share two vertices. The key challenge is making sure you specify them with the correct winding order for your rendering setup.
// Single multi-colored triangle
static const Vertex s_vertexData[3] =
{
{ { 0.0f, 0.5f, 0.5f, 1.0f },{ 1.0f, 0.0f, 0.0f, 1.0f } }, // Top / Red
{ { 0.5f, -0.5f, 0.5f, 1.0f },{ 0.0f, 1.0f, 0.0f, 1.0f } }, // Right / Green
{ { -0.5f, -0.5f, 0.5f, 1.0f },{ 0.0f, 0.0f, 1.0f, 1.0f } } // Left / Blue
};
...
context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
context->Draw(3, 0);
SimpleTriangle sample on GitHub
// Two triangles forming a quad with the same color at all corners
static const Vertex s_vertexData[4] =
{
{ { -0.5f, -0.5f, 0.5f, 1.0f }, { 0.f, 1.f } },
{ { 0.5f, -0.5f, 0.5f, 1.0f }, { 1.f, 1.f } },
{ { 0.5f, 0.5f, 0.5f, 1.0f }, { 1.f, 0.f } },
{ { -0.5f, 0.5f, 0.5f, 1.0f }, { 0.f, 0.f } },
};
...
context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
context->Draw(4, 0);
SimpleTexture sample on GitHub
As you are new to DirectX, you may want to take a look at DirectX Tool Kit.
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