scenekit

For a voxel art app, the goal is to let users move and rotate a camera in a SceneKit scene then tap to place a block. The code below lets a user rotate a camera by panning. After the gesture ends, we move an existing block so it is -X units on the camera's Z-axis (i.e., -X units in front of the camera). cameraNode is the scene's point of view and is a child of userNode . When the user moves a joystick, we update the position of userNode. Question: Other SO posts manipulate camera nodes by applying a transform instead of changing the rotation and position properties. Is one approach better than

I'm trying to use shaders modifiers with Metal. I cannot figure out to declare uniforms... So far my fragment modifier is: // color changes #pragma arguments float4x4 u_color_transformation; #pragma body _output.color.rgb = vec3(1.0) - (u_color_transformation * _output.color).rgb; This outputs a purple texture, with no log.. If I just have _output.color.rgb = (u_color_transformation * _output.color).rgb , things are ok. I think I'm following the doc but maybe not! The uniform is set with: material.shaderModifiers = [ SCNShaderModifierEntryPoint.fragment: theShaderAbove ] material.setValue

I'm trying to create a test app in which the user can pause an animation by clicking in the SceneView. The SceneView loads the animation from a .dae file created in a 3d app (Cinema 4D). The app successfully plays and loops the animation upon launch. To pause the animation, I used Technical Q&A QA1673 as a reference. In the case of this .dae file, the animation actually comes in as a hierarchy of animations, so I have tried reaching down to each underlying CAKeyframeAnimation and setting its speed to zero. My code currently looks like this: - (void)mouseDown:(NSEvent *)event { SCNNode

In my Swift / ARKit / SceneKit project, I need to tell if the user's face in front-facing camera is parallel to the camera. I was able to tell horizontal parallel by comparing the left and right eyes distance (using faceAnchor.leftEyeTransform and the worldPosition property) from the camera. But I am stuck on vertical parallel. Any ideas, how to achieve that? Assuming you are using ARFaceTrackingConfiguration in your app, you can actually retrieve the transforms of both the ARFaceAnchor and the camera to determine their orientations. You can get a simd_float4x4 matrix of the head's orientation

I'm working on simple side project and small part of it is rendering a terrain. I'm rendering the terrain using height map information. But here is my problem: I would like to render just a silhouette/outline of the terrain/horizon. Here is screenshot from my app rendering height map: And here is screenshot similar to desired result from peakfinder.org: I would like to draw just lines representing silhouette of terrain with the rest transparent or solid colour. How can I solve it? Calculate local maximum somehow? I created sample project here , in case you want to help me. Thanks! 来源： https:/

I'm currently following David Roonqvist's 3D Graphics with SceneKit book. Chapter 5 deals with hit testing, no issues implementing it, but only deals with his testing from mouse events. Now, I know my camera's orientation will ALWAYS intersect a certain geometry. I need to obtain the texture coordinate of the intersecting point between the camera orientation and the geometry. Any pointers as how to go about it? I've been looking all over without much success. Any help is appreciated. I haven't tried this but... SCNHitTestResult returns, among other things, textureCoordinatesWithMappingChannel(

I'm playing around and trying to implement Metal shader in SceneKit that will outline an object. The idea is to draw an outline (or silhouette) similar to this image found in this blogpost (the blogpost doesn't contain any code): I'm new to SceneKit and Metal shaders so I'm able just to draw some geometry and write simple vertex or fragment shader. I'm curious how can I achieve this kind of effect? Is it done in multiple passes? Cheers! The basic idea here is to clone the "selected" node and its geometry, then use a custom vertex and fragment shader to "push" the geometry out along the vertex