Generating Physical Objects
We need some geometric primitives that the player can move around the Play Area and shoot at. Let's generate them via code.
A primitive should have a body and a shape to collide with the Player Character and be affected by gravity. We have implemented interaction with bullets via Intersections at the previous step, so we should set the BulletIntersection bit for the object's Intersection mask.
When the robot moves fast and the application framerate is low, the character will be teleported each frame and may go through physical objects due to discrete collision detection. To avoid this we are going to use continuous collision detection.
- Create a new C# component and call it ObjectGenerator. Copy the following code and save it in your IDE to ensure it's automatic compilation on switching back to UnigineEditor. This component generates the physical objects and places them in the world.
ObjectGenerator.cs (C#)
public class ObjectGenerator : Component { private void Init() { // cube Mesh meshBox = new Mesh(); meshBox.AddBoxSurface("box_surface", new vec3(1.0f)); ObjectMeshStatic box = new ObjectMeshStatic(meshBox); box.TriggerInteractionEnabled = true; box.SetIntersectionMask(0x00000080, meshBox.FindSurface("box_surface")); // check the BulletIntersection bit box.WorldTransform = MathLib.Translate(new vec3(0.5f, 7.5f, 1.0f)); box.SetMaterialPath("materials/mesh_base_0.mat", "*"); box.Name = "box"; BodyRigid bodyBox = new BodyRigid(box); ShapeBox shapeBox = new ShapeBox(bodyBox, new vec3(1.0f)); new ShapeSphere(bodyBox, 0.5f); bodyBox.ShapeBased = false; bodyBox.Mass = 2.0f; // sphere Mesh meshSphere = new Mesh(); meshSphere.AddSphereSurface("sphere_surface", 0.5f, 9, 32); ObjectMeshStatic sphere = new ObjectMeshStatic(meshSphere); sphere.TriggerInteractionEnabled = true; sphere.SetIntersectionMask(0x00000080, meshSphere.FindSurface("sphere_surface")); // check the BulletIntersection bit sphere.WorldTransform = MathLib.Translate(new vec3(4.5f, 5.5f, 1.0f)); sphere.SetMaterialPath("materials/mesh_base_1.mat", "*"); sphere.Name = "sphere"; BodyRigid bodySphere = new BodyRigid(sphere); new ShapeSphere(bodySphere, 0.5f); bodySphere.ShapeBased = false; bodySphere.Mass = 2.0f; // capsule Mesh meshCapsule = new Mesh(); meshCapsule.AddCapsuleSurface("capsule_surface", 0.5f, 1.0f, 9, 32); ObjectMeshStatic capsule = new ObjectMeshStatic(meshCapsule); capsule.TriggerInteractionEnabled = true; capsule.SetIntersectionMask(0x00000080, meshCapsule.FindSurface("capsule_surface")); // check the BulletIntersection bit capsule.WorldTransform = MathLib.Translate(new vec3(4.5f, 0.5f, 3.0f)); capsule.SetMaterialPath("materials/mesh_base_2.mat", "*"); capsule.Name = "capsule"; BodyRigid bodyCapsule = new BodyRigid(capsule); new ShapeCapsule(bodyCapsule, 0.5f, 1.0f); bodyCapsule.ShapeBased = false; bodyCapsule.Mass = 2.0f; } } - Switch back to the UnigineEditor and create a new Dummy Node, rename it to "object_generator", and place it somewhere in the world.
- Attach the created ObjectGenerator component to the "object_generator" node to make it generate physical objects on the initialization.
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Create 3 new materials in the UnigineEditor by choosing Create->Create Material in the Asset Browser. Make them children of the mesh_base material, give them names as specified in the previous code snippet (mesh_base_*), and move them to the data/materials folder of your project (create this folder if it doesn't exist).
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Select materials one by one in the Materials window and in the Parameters window switch to the Parameters tab and click on the color field near Albedo to choose different colors for the objects via the color picker.
- Save changes to the world via Ctrl + S.
- Run the project via the UnigineEditor to see the spawned physical objects in the world.