private void CreateGeometry()
{
// Create box
Geometry box = new Geometry(OptixContext);
box.PrimitiveCount = 1;
box.BoundingBoxProgram = new OptixProgram(OptixContext, boxPath, "box_bounds");;
box.IntersectionProgram = new OptixProgram(OptixContext, boxPath, "box_intersect");;
box["boxmin"].Set(-2.0f, 0.0f, -2.0f);
box["boxmax"].Set(2.0f, 7.0f, 2.0f);
Geometry chull = null;
if (mTutorial >= 9)
{
chull = new Geometry(OptixContext);
chull.PrimitiveCount = 1u;
chull.BoundingBoxProgram = new OptixProgram(OptixContext, shaderPath, "chull_bounds");
chull.IntersectionProgram = new OptixProgram(OptixContext, shaderPath, "chull_intersect");
uint nsides = 6;
float radius = 1;
Vector3 xlate = new Vector3(-1.4f, 0, -3.7f);
BufferDesc desc = new BufferDesc()
{
Width = nsides + 2u, Type = BufferType.Input, Format = Format.Float4
};
Buffer chullBuffer = new Buffer(OptixContext, desc);
float angle = 0.0f;
BufferStream stream = chullBuffer.Map();
for (uint i = 0; i < nsides; i++)
{
angle = (float)i / (float)nsides * (float)Math.PI * 2.0f;
float x = (float)Math.Cos(angle);
float y = (float)Math.Sin(angle);
stream.Write <Vector4>(Utils.CreatePlane(new Vector3(x, 0, y), new Vector3(x * radius, 0, y * radius) + xlate));
}
float min = 0.02f;
float max = 3.5f;
angle = 5.0f / (float)nsides * (float)Math.PI * 2.0f;
stream.Write <Vector4>(Utils.CreatePlane(new Vector3(0, -1, 0), new Vector3(0, min, 0) + xlate));
stream.Write <Vector4>(Utils.CreatePlane(new Vector3((float)Math.Cos(angle), 0.7f, (float)Math.Sin(angle)),
new Vector3(0, max, 0) + xlate));
chullBuffer.Unmap();
chull["planes"].Set(chullBuffer);
chull["chull_bbmin"].Set(-radius + xlate.X, min + xlate.Y, -radius + xlate.Z);
chull["chull_bbmax"].Set(radius + xlate.X, max + xlate.Y, radius + xlate.Z);
}
// Floor geometry
Geometry parallelogram = new Geometry(OptixContext);
parallelogram.PrimitiveCount = 1;
parallelogram.BoundingBoxProgram = new OptixProgram(OptixContext, parrallelPath, "bounds");;
parallelogram.IntersectionProgram = new OptixProgram(OptixContext, parrallelPath, "intersect");;
Vector3 anchor = new Vector3(-64.0f, 0.01f, -64.0f);
Vector3 v1 = new Vector3(128.0f, 0.0f, 0.0f);
Vector3 v2 = new Vector3(0.0f, 0.0f, 128.0f);
Vector3 normal = Vector3.Normalize(Vector3.Cross(v2, v1));
v1 *= 1.0f / (v1.LengthSquared());
v2 *= 1.0f / (v2.LengthSquared());
float d = Vector3.Dot(normal, anchor);
Vector4 plane = new Vector4(normal, d);
parallelogram["plane"].Set(ref plane);
parallelogram["v1"].Set(ref v1);
parallelogram["v2"].Set(ref v2);
parallelogram["anchor"].Set(ref anchor);
string boxMtrlName = mTutorial >= 8 ? "box_closest_hit_radiance" : "closest_hit_radiance";
string floorMtrlName = mTutorial >= 4 ? "floor_closest_hit_radiance" : "closest_hit_radiance";
Material boxMtrl = new Material(OptixContext);
boxMtrl.SetSurfaceProgram(0, new SurfaceProgram(OptixContext, RayHitType.Closest, shaderPath, boxMtrlName));
if (mTutorial >= 3)
{
boxMtrl.SetSurfaceProgram(1, new SurfaceProgram(OptixContext, RayHitType.Any, shaderPath, "any_hit_shadow"));
}
boxMtrl["Ka"].Set(0.3f, 0.3f, 0.3f);
boxMtrl["Kd"].Set(0.6f, 0.7f, 0.8f);
boxMtrl["Ks"].Set(0.8f, 0.9f, 0.8f);
boxMtrl["phong_exp"].Set(88.0f);
boxMtrl["reflectivity_n"].Set(0.2f, 0.2f, 0.2f);
Material floorMtrl = new Material(OptixContext);
floorMtrl.SetSurfaceProgram(0, new SurfaceProgram(OptixContext, RayHitType.Closest, shaderPath, floorMtrlName));
if (mTutorial >= 3)
{
floorMtrl.SetSurfaceProgram(1, new SurfaceProgram(OptixContext, RayHitType.Any, shaderPath, "any_hit_shadow"));
}
floorMtrl["Ka"].Set(0.3f, 0.3f, 0.1f);
floorMtrl["Kd"].Set(194 / 255.0f * .6f, 186 / 255.0f * .6f, 151 / 255.0f * .6f);
floorMtrl["Ks"].Set(0.4f, 0.4f, 0.4f);
floorMtrl["reflectivity"].Set(0.1f, 0.1f, 0.1f);
floorMtrl["reflectivity_n"].Set(0.05f, 0.05f, 0.05f);
floorMtrl["phong_exp"].Set(88.0f);
floorMtrl["tile_v0"].Set(0.25f, 0, .15f);
floorMtrl["tile_v1"].Set(-.15f, 0, 0.25f);
floorMtrl["crack_color"].Set(0.1f, 0.1f, 0.1f);
floorMtrl["crack_width"].Set(0.02f);
Material glassMtrl = null;
if (chull != null)
{
glassMtrl = new Material(OptixContext);
glassMtrl.SetSurfaceProgram(0, new SurfaceProgram(OptixContext, RayHitType.Closest, shaderPath, "glass_closest_hit_radiance"));
glassMtrl.SetSurfaceProgram(1, new SurfaceProgram(OptixContext, RayHitType.Any, shaderPath, mTutorial > 9 ? "glass_any_hit_shadow" : "any_hit_shadow"));
Vector3 extinction = new Vector3(.80f, .89f, .75f);
glassMtrl["importance_cutoff"].Set(1e-2f);
glassMtrl["cutoff_color"].Set(0.34f, 0.55f, 0.85f);
glassMtrl["fresnel_exponent"].Set(3.0f);
glassMtrl["fresnel_minimum"].Set(0.1f);
glassMtrl["fresnel_maximum"].Set(1.0f);
glassMtrl["refraction_index"].Set(1.4f);
glassMtrl["refraction_color"].Set(1.0f, 1.0f, 1.0f);
glassMtrl["reflection_color"].Set(1.0f, 1.0f, 1.0f);
glassMtrl["refraction_maxdepth"].Set(100);
glassMtrl["reflection_maxdepth"].Set(100);
glassMtrl["extinction_constant"].Set((float)Math.Log(extinction.X), (float)Math.Log(extinction.Y), (float)Math.Log(extinction.Z));
glassMtrl["shadow_attenuation"].Set(0.4f, 0.7f, 0.4f);
}
GeometryInstance boxInst = new GeometryInstance(OptixContext);
boxInst.Geometry = box;
boxInst.AddMaterial(boxMtrl);
GeometryInstance parallelInst = new GeometryInstance(OptixContext);
parallelInst.Geometry = parallelogram;
parallelInst.AddMaterial(floorMtrl);
GeometryGroup group = new GeometryGroup(OptixContext);
group.AddChild(boxInst);
group.AddChild(parallelInst);
if (chull != null)
{
GeometryInstance chullInst = new GeometryInstance(OptixContext);
chullInst.Geometry = chull;
chullInst.AddMaterial(glassMtrl);
group.AddChild(chullInst);
}
group.Acceleration = new Acceleration(OptixContext, AccelBuilder.Bvh, AccelTraverser.Bvh);
OptixContext["top_object"].Set(group);
OptixContext["top_shadower"].Set(group);
}
